Have a gen2. Here is the deal. Car will run fine from all floors with the exception of bottom floor. Whenever we run to bottm get a ntb input error. Ntb signal is working so i decided to do a learn run. Very strange problem. The learn run will start and learn first floor fine. It will then keep counting until it gets to around 2600 counts. Then it will skip to 420,000 and continue counting fine from there. It wont complete run. Any way i can run on inspect and monitor position and slow car down to 10 fpm and watch the pos count properly until it gets to 2600 the next pulse pos jumps to 420,000. If i run down it will g from 420,000 to 2600 and count fine. Any ideas. Thinking maybe mlb board or cpu