Rdd1956

My 07 ls trailblazer has a weird tpms problem. I had new tires and sensors installed. Dashlight came on 8 times in next week. Took back to tire shop installed all new sensors for second time. System would not relearn. Tried another tire shop. Tpms playing musical tires with relearn. One time LF won’t relearn then light still stays on. Next time one or both rear tires won’t relearn. Light blinks for about a minute when vehicle is started then goes solid till next time started. Tried resetting by disconnecting neg battery cable for 30 minutes still no luck. Does enter relearn after this. But last time LF wouldn’t relearn. HELP!!!!