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[camper123]

I have a CM15a module whose internal clock runs very fast, about five minutes fast per day.

I know this because I have a timer that turns on a lamp at 8:30 pm each day (no security randomness is enabled).   The first evening, the lamp comes on right on time, 8:30pm.  Then the next evening, the lamp comes on around 8:25pm, then next 8:20pm, etc.

I have cleared memory and downloaded the timers and macros, and set the clock, twice.   

I have unplugged the unit, removed the batteries and let it sit for an hour; then put the batteries back in, plugged it back into the wall, and downloaded the timers and macros, and set the clock.

No happiness.  The internal clock still runs fast.

What do I do next?

[steven r]

Call X10!

I assume that your computer is still keeping the correct time.

If it's under warranty then get them to send you another one.