TPMS light is off for the first 2 minutes of driving then the TPMS dash light flashes intermittently and then after a few more minutes the TPMS dash light just stays on.  So, first 5 minutes of driving its OK; then light starts flashing; then it goes on and stays on but occasionally goes off for a while. Had all four tire TPMS sensors checked with TPMS wifi meter and at that time all four were OK and transmitting) but it may be that at lease one is intermittent since they are 8 years old no