thats why it is a good idea to throw in an extra network card & cheap hub then split it off,
or re-direct the miner traffic via WIFI to a separate hub......, keeping the big traffic on a switch.
Personally I also keep a mobile phone on standby with a bluetooth network redirector setup in the controlling SBC, should it loose connectivity via cable/WIFI....
The fact connection interrupts is not a problem itself. The problem is that cgminer never recovers after interruption for us.
Yup im still having same problem in every version of cgminer, ya cgminer never recovers after it got interrupted stratum, so no matter failOver setting i set, it never be recover