My sentry earphones randomly stopped playing any ideas why or how to fix them?

Sentry BT400 Headphones Manual [pdf]

Sounds like the wires are broken from stress or the mini jack is not inserted completely.

Headphone jack compromised

update your firmware or reset the i pod it will solve your problem

Good morning,
I would start off with calling Bose they do have a good warranty program and would help you.

you need to have the lazer lense cleaned by a pro or buy a lens cleaning cd and load it about 5 times i think youl find it will fix your problem

cheers

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The phones are probably not reaching the bottom of the connection where the MP3 is told to stop sending sound to the speaker.

Test with other phones.

If the problem persists, a firmware update would be a good idea.

Cheers

i wrote an article on how to fix this a while ago. http://www.fixya.com/support/t271542-no_left_ear_sound

Playing some Mp3 players at full volume can cause this problem. Once the damage is done, there is no fix - sorry.

i bought a mp4 player 2 months ago through net when i brought theplayer it was working fine but now it has totally changed its keys arenot working properly and earphone socket also not working properly .When I [put my earphonesinto my mp4 u have 2 fiddle alote to get them in right so I can here...and also the earphones are working fine with other mp3 and mp4 playerso i don't think there is any problem in earphones