I upgraded to a Hopper with Sling and OTA module 2 weeks ago. I have created about 30 timers. All the timers have worked perfectly at first. A few timers(about 4) have quit working. The non working timers are still listed but once the hopper ignores it one time it never works again. I have reentered the faulty timers and they start working again. Any ideas why the timers would stop working in the first place?