hi
i have GY-GPS6MV2 (Ublox NEO-7m and NEO-8m) this modules work fine initially, but after 3 days of continuous operation without shutting down, it suddenly stops working. It only starts working again after a power cycle (disconnecting and reconnecting the power. i have no idea for that
let it run with the demo sketch for 3 days. If it breaks again, post that demo sketch and pictures of your installation.
If the demo sketch doesn't break, the problem is in your current sketch.
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Not my area of expertise but I think that those that might be able to help will need a schematic/wiring diagram and the program. Please use code tags as described in https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum/679966#posting-code-and-common-code-problems when posting code.
Which controller is it connected to?
Hi, @ali_aam
Welcome to the forum.
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
How have you got the GPS powered?
Thanks... Tom.... 
