What would make an AC3 reboot?

[IRISSERVICE]

What would make an AC3 reboot on its own?
I noticed a few times this past week my AC3 decided to reboot on its own.
here is my program just in case it that..

MH1$-A09 Metal Halide 1
MH2$-A01 Metal Halide 2
MH3$-A02 Metal Halide 3
RLT$-A03 Refugium light
ACT$-A04 Actinic lights
WVE#-A05 wave box
SKM#-A06 skimmer
MRP$-A07 media reactor
MON$-A08 led lights
HTR%-A10 heater
CF1%-A14 cooling fan
CHL%-B01 chiller
KMP&-B05 kalk mixing
UVL$-B06 uv light
ROW&-B07 top off
ODH%-B08 outdoor heater
FED&-A13 feeder


If Time > 15:00 Then MON ON
If Time > 16:31 Then MON OFF
If Time > 02:00 Then MON ON
If Time > 03:00 Then MON OFF
If Temp > 82.5 Then MON OFF
If Time > 16:30 Then ACT ON
If Time > 02:00 Then ACT OFF
If Temp > 82.5 Then ACT OFF
If Time > 18:30 Then MH1 ON
If Time > 00:45 Then MH1 OFF
If Temp > 81.8 Then MH1 OFF
If Power 005 Then MH1 OFF
If Time > 18:45 Then MH2 ON
If Time > 01:00 Then MH2 OFF
If Temp > 82.0 Then MH2 OFF
If Power 006 Then MH2 OFF
If Time > 19:00 Then MH3 ON
If Time > 01:15 Then MH3 OFF
If Temp > 82.2 Then MH3 OFF
If Power 007 Then MH3 OFF
If Time > 00:01 Then RLT ON
If Time > 20:00 Then RLT OFF
If Temp < 77.0 Then HTR ON
If Temp > 77.5 Then HTR OFF
If Temp > 78.1 Then CF1 ON
If Temp < 77.3 Then CF1 OFF
If Temp > 79.5 Then CHL ON
If Temp < 78.0 Then CHL OFF
If Power 005 Then CHL OFF
If Time > 00:00 Then UVL ON
If Time > 00:00 Then WVE ON
If Time > 00:00 Then SKM ON
If TmpA < 50.5 Then ODH ON
If TmpA > 51.0 Then ODH OFF
OSC 005/240 ON/OFF Then KMP ON
OSC 001/070 ON/OFF Then ROW ON
If Time > 00:00 Then FED ON
If Time > 00:00 Then MRP ON