Was something changed at the Delegate Harvesting feature? For a short time, the function always switches to inactive. I have to activate it manually almost daily. Previously, the feature was active for weeks after activation. Is there any way to control it and maybe even enable it automatically when it's inactive?
That'll be your individual super node being flaky. Mine's been rock solid forever. They have mandated an upgrade with more ram so perhaps the operator skimped on it.
https://nem-tools.com/#/home is a way to automate the restart of harvesting I think but start off by trying a different node perhaps.