Might not be relevant but I have a Fandango Pro from Giant loop as my tankbag and used to charge my phone while riding and streaming music to my Sena headset. After a few rides I noticed the phone would drop out and I would lose my music. I realised that it was due to temperature and the phone would shutdown due to overheat.
Pull it out of the clear windo and it was scorching hot...I guess the glasshouse effect in direct sunlight really creates an unhappy environment for electronics. Pitty as it was a cery convenient place to charge the phone and keep an eye on the screen during calls and playing music.

The tank bag is waterproof, so I just don't put it in the window anymore, just throw it inside and charges while riding.
Matt.