Ezplus commands are slow or do not complete

My ezplus has issues: Scenes either do not run or only some of the devices receive commands. Other times when I initiate a command, the devices either do not respond at all or they respond much later (over 30 seconds).

It has become unreliable. Scenes that open blinds or close blinds work haphazardly, if at all, at times. It is operating extremely slow, takes too long to respond, if at all.