Nano logging issues

On a few recent flights I have had some issues with my Nano "freezing up" in flight. I have a Nano connected to my Oudie with the Socket mobile power pack and a goddard cable. Usually it has worked flawlessly with no issues noted. Last two flights at some point the Oudie moving map display "freezes" such that the little glider doesn't move anymore. Oddly enough it seems that the nav boxes continue to update with required L/D data etc. After a few minutes everything starts working again. During this time on my flight yesterday I pulled the Nano out of my side pocket and all 3 lights were blinking, indicating a good GPS location and that it was logging.

However when I look at the trace post flight there is a period of ~2 minutes where no position was logged. Here is the flight yesterday: http://www.onlinecontest.org/olc-2.0...l?dsId=2513934

Check out the area from the 2nd half of my 2nd thermal on course to the beginning of my 3rd thermal on course. the trace seems to get coarse during the 2nd climb and then has a big jump before starting the 3rd climb.

I will note that I noticed this time that the "low battery" light on the socket mobile power pack was blinking, which is strange because it was supposedly fully charged 2 nights before the flight with no use in between. There was no warning given on the Oudie that external power had been lost or that it had switched to the internal GPS, which would happen if external power was lost.

and here is another flight where the same issue occurred:
http://www.onlinecontest.org/olc-2.0...l?dsId=2340248

You can see on the OLC barogram where the ground elevation is not shown where the logging issues popped up.

Anyone seen similar issues or have any ideas?