CENS ear protectors

[ilovemyheckler]

Anyone know what the warranty period is on these?

I bought a pair of CENS ProFlex+ Competition ear protectors in May 2017 and recently I have been having problems with the left unit;

 
1. The battery runs flat vey quickly. I put new batteries in both units on Saturday night but when I put them in on Sunday the left battery had no power
 
2. I put a new battery in and while I was shooting the left unit kept switching off. If I tapped the unit it came back on momentarily 
 
3. The left unit doesn’t seem to switch off
 
Any advice?

 

[Centrepin]

I'm no expert, it just sounds like a loose battery, bad connection or similar. Can you strip them down to check or will it damage them.