.....and all the sudden it just stops Waite's a few seconds then resumes. when it is stopped the lamp is out but the timer is still lit up and the beeps stop also. at other times when it stops it will not restarting i turn the power off and then back on.....
First, an additional question..... When the timer is counting down, does the enlarger lamp extinguish before the timer is at "zero"? If so, I suspect the problem is in the enlarger head. Perhaps a loose connection to the bulb? The Z6 timer has a light probe connected to the head, and will adjust the timing to the lamp output. If the enlarger lamp quits, the timer will probably slow to a stop, and then resume when the lamp comes back on. When you reset the power, perhaps that also resets the enlarger lamp?
One other question..... Is the head a Zone 6 head? and if so, what model.... 2-tube or one tube?
The Z6 is a very nice timer. You will enjoy it when everything works right.