One of the main reasons TST is so well recommended is their very high level of customer service. Although we could speculate why you experienced this issue, I feel you would be best served by calling TST directly.
Having said that, you could have low batteries in your sensors. Another possibility is the length of your vehicle may require the optional range extender/repeater that TST offers.
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)