I would do the best I could to find out where that water is coming from.

Quite frankly I think any freezer that shuts itself off after a power outage is a very poor design. Makes no sense at all. Check your operators manual to see if this is true.
I have a couple fridges at the cabin, we loose power at least 5/6 times a year, often when we are not there. If they shut down after an outage it would have cost me thousands of dollars in food over the past 20 years.

Sounds to me like you have a problem with the actual freezer.

I would get a service rep in under warranty.
If nothing else to document the problem. You could do this on the phone but make sure you get the name, phone extension etc. of who you are talking to.

The problem is intermittent so may be a pain to find it but insist that it is found and try to get the warranty extended for this problem.
Give them 3 shots at fixing it and if they cannot tell them you want a replacement unit.
Your warranty is going to run out and they will say tough luck.

You could put a surge protector on it just be sure it will handle 15 amps.