nfs hangs after wakeup from hibernation, kernel 4.2.0-*

For a couple of tears I have usually not shut down my pc after using it, I just leave it and let it hibernate.
(Of course I have also shut down the system completely every now and then.)
This has worked well but recently with new kernels 4.2.0-* I get problems that I suppose comes from nfs.
I have my firefox account and a folder in my PATH on a server with the file system automounted using nfs.
 - each new terminal window hangs without a prompt
 - a busybox terminal with a simpler PATH works ok
 - when I click on anything in the firefox window it hangs and is greyed-out. The system says "not responding" if I try to kill it

Now I have booted the system with kernel 3.19.0-32-generic which is the last one that works as expected.

What more info do you need?

Regards,
Seved