I don't know if it is a solution but I used to have a bunch of Series Recordings with time added before and after. I no longer do that and have been fine since. One other thing to do is rearrange your Series Recordings until the problem goes away. Time consuming and painful because you will either lock up immediately or have to wait till 4:20 am / 4:50 pm to see if your problem is resolved or not.
Give it a try and post back what you find.