smart start smart start interlocks are set up to fail you internet for sure Nationwide

i have had my smart start interlock for almost five years. the first year i was having problems with it didnt think about it. Month after month and year after year i have had violations that werent right,had to have my truck towed twice. the lastest is i blew into the machine and started it. i drove 4 b;lock to work. i pulled into my parking space and it went off. I reached for it and nocticed that it had a violock4days before i blew. Now with these guys i have been stranded with out a truck for days and thet tell me to dispute the charge well my emails are never answered the Only time i got money back is when i video taped the machine acting up. At christmas the unit was crackling i called and the lady asked me if the unit was smoking. Also when i blow into it first time in the morning it always saids abort tamper. So i called the shop i deal with and they are going to swap out the unit head no this make 21 units in my truck in 4 1/2 years. i think these things are rigged to give violations so they can keep you on longer. any one else have these problems?