We have a 4 unit stack of m4300-52G switches running firmware 12.0.19.15.

We have a 4 unit stack of m4300-52G switches running firmware  12.0.19.15.
Suddenly as of today SNMP stopped working fully, i cant accces the webinterface, cant access webinterface from OOB and cant even use the physical console to get into the master unit of the stack (unit 1) . The member units 2 to 4 are still up.

Even set sup-console or session start to unit 1 from another member unit hangs. 

So there is nothing i can do to even debug when connection to the master unit is impossible. Its very much related to your issue and the other forum. 

I'm also wondering if the issue is fixed in the new firmware release. There is no hard conformation