Since it's not your router, the call is to the ISP.
Since about 4 weeks ago, my laptop cannot reconnect to my wireless gateway at home after it wakes from sleep mode. I think the problem is with the gateway because whenever the laptop can't connect, my droid phone can't either. I also did the following test once: I rebooted the gateway, successfully connected and then disconnected to it from my cell phone, then again I couldn't connect to it neither from my laptop nor the cell phone.
My laptop runs a Windows 7 Pro 64-bit and has the intel centrino advanced-n 6230 wireless adapter. I'm also have Verizon's Westell Versalink 7500 gateway. If more specs are needed please let me know.
I'd appreciate it if anyone can help me to solve the issue.