Call TH in the A.M. If the timer is younger than 5 years old it's under warranty. Send them the timer, they'll test it and if found defective, they'll replace it.

Had sort of the same problem on a friends TH feeder in Texas. He sent the timer in to them, they said it was good, but when he re-installed it everything worked fine.

One last test before sending it out, unplug it and plug it back in again. Maybe connections got a wee bit of corrosion on them?

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).