i have the same issue. randomly closes at multialgo and work like a charm for weeks at single algo. rigs 8-9 vegas. nothing unusual in logs.
The developer said he hoped this would be fixed in this new version, but today I experienced it again: the miner window closed by itself and there wasn't anything unusual in the logs, just normal mining.
Could you guys tell me which version of windows 10 are you using?
I have a feeling it is older than 1809.