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Put simply -
1) try long shot on battery
Don't work == bodgy camera -> return it,
2) Try it on several mains powerpoints in doors
Same result = bodgy adapter -> return it
else
3) Suspect your powersupply outside is poor quality - run it into a small UPS to get line quality up and run the adapter into the UPS
Any remaining problem is wierd - check it with Canon and/or more your viewing site in case you have background noise or radiation!
else its a crappy adapter (transformer or cable) - return it for a swap.
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