Consistent Keg Carbonation problem?

[NotSoNew2Brew]

I currently have a three keg set up in the garage. I have noticed that sometimes when I pour a beer, the CO2 wont kick in (the hissing sound) to equalize the psi in the keg, and I am wondering if I have a regulator that may need cleaning or replacing.

Recently I've had beer come out from faucet just a tad under carbonated, yet still drinkable, THEN a few days later, it was more adequately carbonated and there were no adjustments made. Mind you I have had the same equipment for 15 years or so since I started brewing.

anyone else have a similar issue?

 

[Bensiff]

Could be that the reg is dirty...they are pretty easy to pull apart and clean up.

 

[NotSoNew2Brew]

A little cleaning got it close to back to normal again. Thinking o will need to replace soon though.