Packets are arriving malformed
What it looks like in your log
Badly compressed packet - size of 1 is below server threshold of 256
What causes it
Client and server disagree about the protocol: mismatched mod sets, a wrong network-compression-threshold, or double compression behind a proxy.
How to fix it
Match the client and server mod lists exactly. Keep network-compression-threshold at 256, or -1 on backends behind a proxy that already compresses.
Not sure this is your problem? Paste your log and Roastd will tell you which of these it actually matched, and what else it found.
Check your own log