my car tire pressure playing games with me

[clueless69]

hi.all title say it all because it is funny(i mean not funny anymore)tires loosing pressure there is no logic sometimes never get error message for tire pressure malfunction in month i do drive like 50 miles a month. yes i did measure pressure with oem bmw digital gadget and it show corect side what the vehicle say.can it be bad or old valve core.i have plastic caps. i did balance my all tires,was trying go cheap but some shops dont have required equipment even get wheel on balancer. so i went to goodyear they spend an a hour and they say cant find any leaks.did anyone had familiar problem.thanks

[digitys]

I just had to have one of my TPMS sensors replaced as it was low on battery. The light was incessant and obnoxious at all times driving. The cost was roughly 50 bucks. Light is gone and annoyance is gone.