Windows Media Player

WMP Help
I have a Samsung Note 4 and a huge collection of WMA and MP3 music files on my laptop.
Since Deccember last year, I have been using Windows Media Player to sync all of my laptop music to my phone in the order of the various playlists I have created on my computer.
This has been working wonderfully and very reliably until a couple of weeks ago.
I have noticed that every new music file I have added since then has syncs across the first time I sync it, and then the next time I add the next few MP3 files, the ones I had just added previously are then removed from the playlists on the phone (and come up with an error message on the left hand side of the syncing list of Windows Media Player as they attempt to sync).
I have tried every possible combination of fixes: reloading the files, deleting the folders and syncing again, deleting the playlist files from the computer, turning the phone off and then syncing again, etc, etc.
I fear that the number of times I have replugged my phone into the computer every time there is an error message is going to start damaging the lifespan of my battery.
It is incredibly frustrating because it has been working so well up until a few weeks ago.
Is there a problem with the latest incarnation of WMP 12, is there an incompatibility with the latest Android software update, is there something you can do to fix this for me.
I would like to keep using Windows Media Player because it has served me well for the last 12 years, and because I have built very large and well-organised playlists over this time that I do not want to lose.
Please help!
Kind regards,

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(NT) add larger flash memory
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"Add extra flash memory" to the phone or to the computer?

... and how would I go about adding extra flash memory? Not sure how to do this.

And would you be able to please give me some pointers as to how would it help?

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internal vs external flash on phone

" A phone like this was made for taking photos and viewing the screen at length, which is why its 32GB of internal storage is crucial. If you need more, you can buy a microSD card that holds up to 64GB more."

check the size of data you are trying to sync and see if it exceeds the phone's data capability. Obviously you can't "sync" more data than the phone can hold.

general info
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How much free space do I need to maintain on an SD card?

I have a 64Gb card currently installed to store my 10000 or so songs.
It now has around 5Gb free space remaining (I store photos on there, too).
I am planning to buy a bigger SD card next month. Do SD cards start to manage data less reliably like this when the free space goes below 6 or 7 GB?

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I can't say, don't know that answer

I would think external flash would be just for data, but probably also used for apps too. There used to be restrictions on how many files and folders could be in the root directory. This also could be something unique to the device. From where did you get the free space amount? Was it a reading from the device, or did you pull it out, plug into a computer and get it from there? I'd at least see what the computer says about it, concerning space, to be sure. It might not match what the device says. Also don't know if you can use more than 64GB flash in that device, that might be the max it can use. One way to check would be remove a few GB's of stuff, then see if the same thing happens as you add some back over time, or doesn't happen till you reach the same reported amount of free space.

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Seems to be a free space limit to syncing a 64Gb SD card

I derived the remaining space firstly from the Samsung Smart Manager (Clean Master) reading on the phone itself, but also confirmed each time I plug the phone into the computer (Windows Media Player, when syncing, lists the space remaining on the right hand side sync panel at the top) and also when I check on Windows Explorer.
I deleted some folders so I could get to 7.2 Gb and resynced one of my playlists, as you suggested, and it was more successful. Then I tried again with the same problem reappearing. It would appear that 64Bb SD cards stop syncing properly on Note 4s when they reach capacity minus 7Gb. Can anyone else confirm this?
Fortunately, the Note 4 allows a 128Gb extension SD card (I think) so I hope that, once I have purchased a 128Gb card, the problems will disappear.

Thank you so much James for your answers to my queries.
Do you (or does anyone else) know of better alternatives to Windows Media Player for syncing? I checked the two links that James posted and sadly these sync music but not playlists. Since my playlists have been painstakingly compiled over the last ten years, I would want a solution that brings these across. I have heard that some applications allow air syncing these days.
Thanks again to James for your answers.

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at least you know the limits now

I myself am not into all that music stuff, my preferred cellphone is a motorola C130 tracfone I leave in my van all the time for emergency use only. I rarely turn on the radio in my van, unless stuck in traffic and then to something easy listening for relaxation. Good luck on finding a better program to sync with.

drives = 1 GB = 1,000,000,000 bytes
computer = 1GB = 1,073,741,824 bytes

this is because drives are sold in decimal measure where 1 KB is 1000 bytes, and computers use base 2 so a KB is 1024 bytes. A GB is 1024x1024x1024= 1,073,741,824 bytes

Because of the difference between how space is measured on drives compared to how computers measure space, every 1 GB of storage on a drive is actually only 931 MB's storage space in computer math. For a 64 GB drive, that's 59.6 GB in storage as a computer measures it.

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