(Voice of the Unreal Tournament Announcer: )
Double-Merge!
Triple-Merge!
MERGING SPREE!
Unofficial response, but I believe this issue may be connected to the general "Server Disconnect / Connection Issues" thing. To me, it has always looked as if the server simply loses packages randomly at times, and the game tries to cope with it however it can. So, getting the "lost connection" message, screen going blurry and refusing to respond, the game hanging, crashing, etc. is likely all down to a nasty, little server bug that feeds on murdered joy and crushed dreams.
(This is also why I'm playing The Witcher 3 again. If I find a beast that does such things in TW3, I simply slash it deeply a silver blade, then burn it with a looong Igni blast, followed by knocking it to the ground with Aard, and impaling it while it lies stunned. After that, I can carve its head from its shoulders and hang it from my mount on a meat hook. Then, I parade around with its mangled remains and get
paid. [It's really good stress relief.])