Great addon, by far the best DPS meter for 1.12 I've tried. I have one issue though, I seem to be getting disconnected quite frequently after hitting level 47 with DPSMate enabled while in a group, and it only seems to happen on my higher level character, I'll try going into as much detail as possible. I have the latest version of the addon, uploaded 2016-06-01.
Whenever I'm grouped on my now level 50 hunter, I will get disconnects with various time periods in between them, the frequency seem to be determined by group size or level, with a full group doing a dungeon it happens every 3-10 minutes or so, the disconnects never happen outside of a group.
I wanted to boost an alt of mine through some lower level dungeons, and went into Wailing Caverns with an alt at level 10 on another account, both accounts had DPSMate enabled at first, also with Syncing enabled. This was before I discovered which addon caused the DC's, and I figured while playing in a group by myself would be a good time to start disabling addons until the disconnects stopped, the level 10 had no disconnects at all (disabling 0 addons) while the level 50 had a few DCs until I disabled DPSMate, it was less then when in a full group of roughly equally leveled characters, but still every 15-20 minutes.
Also, the disconnects seem to take longer to happen if I'm not around combat in general (regardless if i engage in combat, someone around me outside of group is enough to trigger it if I'm also grouped with others on the other continent or similar), running around randomly in cities rarely gets me DC'd, but it still happens every now and then if its enabled.