I just checked my log and I have had the Voter lost master timing source message 14 times since November 16.

A few times have been in quick succession.

I run just the one RTCM for both the radio and the master timing source on the network. I haven't had any out of bounds issues though since moving my system to the mountains, it's been working flawlessly.

I'm using a Mikrotik RB2011UiAS router.

I have my Pi (asterisk host) set on Auto negotiation and it's connected at 100mbps full duplex. The RTCM/VOTER board I've switched off auto negotiation and have it at 10mbps and half duplex.