For the Ethereum Wallet or Mist:
The issues list can help determine if your problem is a known bug and how others have dealt with it.
Gitter is the live chat with the community and includes the core developers. (You do not need to install any software to use Gitter since it works with the browser.)
I have had the same issue for a week now and the only solution that has worked for me is to shutdown (ctrl-C) and restart (geth.exe) the sync itself in command prompt.
If anyone could provide a great way to automate a sync restart once the cmnd prompt window displays :
Synchronisation failed: no peers to keep download active
That'd be super swell. Something in Powershell to automate a shutdown restart.