It looks to me like on the rigs with v3.2 the crashes are happening. On the rigs with 3.3 the node is not crashing but it just stops communicating with the server, the node is offline at the minerstat panel, while in reality it is not.
that's look me it updated and marked offline because the main hashrate is detected as ZERO (0). send me your accesskey in Slack or here in private message to i can check later