The WDT reset is happening while query is trying to access the datalog. Usually that means there is datalog damage. When did you get this unit? If it was late last year and you have the order number, it could be one of the units with an archaic FAT format on the SDcard. In any event, I would recommend a few things:
If you suspect problems with the VT, you really should be on release 02_08_02. It is currently ALPHA and BETA auto update, but will be going MINOR in a couple of days. It is much more tolerant of a zero voltage condition.
You appear to have the Reload History box checked on you PVoutput uploader. That causes the uploader to upload history every time the unit restarts. Once you get the system current, with the Reload box unchecked, IoTaWatt will query PVoutput to see where it left off and continue on from there. There is a 14 day limit on lookback in freeloader mode so it won’t accept anything before Feb 17 anyway.
I would recommend reformatting or replacing the SDcard, clearing everything in the /iotawatt directory.