I have this problem every time I go flying with SkyDemon:

When I am on the ground with Wifi connected, SkyDemon (version 3.4.4.23 for iPad) downloads and interprets all data successfully and doesn't have any errors.
When I am in the airplane with 3G/4G connection on iPad Air, SkyDemon gives me these error messages:

Corrupt data detected while interpreting downloaded GAFOR information.
Corrupt data detected while interpreting downloaded SIGMET information.
Corrupt data detected while interpreting downloaded TAF/METAR information.



They pop out all the time until I lose the connection which is pretty distracting. What causes these errors and how to get fi them?

I've experienced a similar issue - albeit not as severe. 

I do find when using a mobile data connection (in my case EE) that I am much more prone to getting corrupt data warnings than when I'm using fixed broadband.

I speculate this may be due to the content compression that mobile network providers like EE use to compress data being sent over their network as I've seen this cause problems with other data services.