Reset at midnight

Guys,

I've been running my prototype thermostat over the weekend, and whilst it appears to run fine (temperatures in the vivariums are maintained to within 0.1 degree C) I've noticed that each morning the set temperatures have reverted to the default temps when the unit is first powered on. Anyway, I had a hunch that it was actually reverting to a pre-set night time temperature drop (normal temp is 30c - default on power up is 28c as is the pre-set night time temp) as I have this bit of code checking the times

Code:

timeH=(RTCHour>>4) 'convert the BCD format of the hours register and store in variable timeH timeH=(timeH &$03)*10 timeH=timeH+(RTCHour&$0F) timeM=(RTCMin>>4) timeM=(timeM &$07)*10 timeM=timeM+(RTCMin&$0F) 'convert the BCD format of the mins register and store in variable timeM LCDOut $FE,$D4+8,#setpoints(0)dig 2,#setpoints(0)dig 1,$FE,$D4+11,#setpoints(1)dig 2,#setpoints(1)dig 1 ' show current set temperatures LCDOut $FE,$D4+14,#setpoints(2)dig 2,#setpoints(2)dig 1,$FE,$D4+17,#setpoints(3)dig 2,#setpoints(3)dig 1 FOR fn = 0 to 3 If StartHour[fn]=timeH and StartMin[fn]=timeM then 'compare value of each start time to current time and if matches SetPoints[fn]=Droptemp[fn] 'change the corresponding set point to the drop temperature LCDOut $FE, $94,"Night" endif if StopHour[fn]=timeH and StopMin[fn]=timeM then 'compare value of each stop time to current time and if matches LCDOut $FE, $94," " SetPoints[fn]= normtemp[fn] 'change value back to normal temperature Endif Next fn RETURN

I sat watching the LCD last night and sure enough at 00:00 the set temps changes from 30c to 28c. My logic was that as the start time equals 00:00 (this is the starting point for setting the variables for the start of the night time temp drop) this would then cause the unit to switch to night temp mode, but then as the stop period also = 00:00 it should cancel out and change the set temp back to the norm temp value.

However, the reason I think the unit is restarting, is because it also ignores any setting for turning lights on (I have yet to implement DT's new routine for lights described in previous post). -

Any ideas as to what might be causing the PIC to reset at midnight ? the code is quite lengthy so it's not something I can include within a post.