HeidiSQL has suddenly become very unstable.

I suspect this might be a windows 10 update issue.

It's suddenly started always using 4GB RAM really easily then crashing, hanging really easily, disappearing into the background and possibly restarting itself.

It just started happening on a version that was previously fine.

It's also possible this is happening if a transaction is locking everything? It's the only thing that changed other than W10's self harm.

I believe it's confirmed as being W10 having a ball with people's life.

If you ever configured the heidisql exe / launcher ages ago for the "don't be weird" compatibility and graphics options since then some W10 update has wiped that and probably changed some things to bake heidisql bork like it's never borked before.