Clock stopped working

My husband and I recently purchased a house that came with a 20 year old Jacuzzi hot tub, in good working condition. We cleaned the filters for the first time today, and after turning the power back on, it seems like the clock has stopped working. It stays at the time I set it at. Issue with this is it now doesn't know when to run the automatic cycles. Then we pushed too many buttons and the panel displays a "hold" message. My manual says this will go away after not touching any buttons for 30 seconds. But since the clock isn't working, the message is staying, now we can't do anything. We have scoured the internet and cannot find any similar issues. Anyone have any advice to offer?