Actually sorry I have to edit this, it won't let me edit so I'm adding an answer:
I think it really is Windows 8.1 and Windows 10. Too many other people are having this same problem. I'm considering somehow going back to Windows 7 unless someone can help me fix this.
I really need to do Skype tutoring as it's part of my job. The problem is that my internet is so poor, the Skype video often cuts out (at least I cannot finish a one hour conversation without it cutting out a couple of times and threatening to cut out more than that).
My internet is free from my apartment and the router (I think that's what it's called, the box?) is the hallway. I thought this problem was caused by Windows 8.1 and Windows 10 because sometimes my cell phone will connect with no problem while my computer's connection goes to "Limited." 90% of the time once I turn the connection off and re-connect it comes back fine. But I can't be disconnecting and re-connecting in the middle of Skype calls.
I have already tried changing the Energy Saving settings so it doesn't turn itself off, I've entered some "netsh" codes in the Command box that was suggested on a site, I've turned off Bluetooth which was also suggested. I tried several other things I found on YouTube. I have also rolled back, and then updated, the Broadcom adapter, to no avail.
I'm starting to think it's not the computer but is my apartment's Internet; though I don't understand why my computer would go to Limited when my phone is working fine (both connected to the same Wifi). I am desperate to fix this so please help me if you have any ideas.
Should I buy a wireless adapter? Would that increase my signal strength so it doesn't cut out? I've tried so many things. My landlord will probably not fix it if it's a problem with the router.
I have a Toshiba Satellite C75 laptop. I can't call Toshiba because I live abroad and I don't think they can help me.