Management Interface has become slow and unresponsive.

Thank you nitass,

we also got the following statement from F5:

The issue is caused by a known bug - "id439637 - Memory leaks in SOD" This happens over time where the failover service SOD increases its memory footprint. There are several cases where the GUI and SSH administration perform poorly as you are experiencing. The SOD daemon will eventually crash or cause other services to crash due to lack of memory resources. The workaround is to reboot the unit once you notice /usr/bin/sod increase in memory size, this temporarily frees the memory and until it happens again.

Ciao Stefan :)