In Nokia, I have often encountered this hanging issue in 80% of cases.
A reset usually improves the situation, but in some cases, R&D team intervention is required, and the root cause is found to be a hardware fault.
You need to dig deeper to identify the failure cause, as it may provide some indication. If not, involving other teams for further investigation is necessary.
Try analyzing accessibility failure causes, as they might give you a useful hint.
Based on experience, this type of degradation is often caused by either the Baseband (BB) unit or the RRU.
As an initial action, try resetting the BB if you haven’t already, especially if the degradation affects all cells. If the issue is isolated to a single cell, then reset the RRU if you haven’t done so yet.