Anyone has reached a solution ? I got with the same issue.
I have a cheap GPS module (GY-GPS6MV2) with the NEO 6M module, and I was running with some issues related to the fix time, so yesterday I received the Adafruit ultimate GPS, but the fix time is much longer than the cheap module.
I added a electrolitic cap (100uF) between VIN and GND and I connected VIN to photon’s 5v pin. After a long time, I can get a first fix, but my test are : put the modules on the balcony, after a fix on both, put them back both modules into the room (near to the window), and the adafruit module has lost the signal (I dont know if is the proper term), but the NEO 6M dont; I put the NEO on a room with no clear access to the windows and the NEO lost the signal. After that I put both modules back to the balcony but after almos half an hour the adafruit module is still in fix phase, but the NEO 6M get pretty much quicker fix.
Thanks if you have any advice.