FPV stopped working (not crashed)

Then I miss understood. Marlin009 brought up a good point about an anti interference board. Are you using one? If so take a photo of it so we can see how it's wired.

Do you remove the antennas from both the TX/RX when your finished flying? Is possible that you put the wrong antenna on the TX?
 
There is one other possibility which is remote but L2 (1uH) on the main board could be intermittent causing loss of power to the TX. The only to know for sure is to measure for voltage. There is a schematic of that circuit and also a photo showing its location of L2 under the gray wire on page 2 of this thread.
http://www.phantompilots.com/viewtopic.php?f=5&t=13510&start=20#p280932

Due to how these components are made the end caps can become intermittent when soldered to the circuit board. The way to check if it is to measure the voltage at the cap while flexing the board or take a continuity check across L2 while flexing the board. L2 is being used as a fuse.
 
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