intermittent remote start

2009 F-250, Viper 5901, PKAll

For some reason this system doesn't always remote start. When it doesn't work, everything appears to be working except the truck appears to have disabled the start system (truck security light blinks rapidly when it doesn't work, slowly when it does). It is as if the PKAll doesn't always work. By doesn't work, I mean it doesn't activate the starter, everything else seems to be functioning.

I have tried by putting the key in the ignition when it failed and it will start on the next attempt, but being an intermittent problem, it could be coincidental, though the indications seem to be the PKALL not bypassing the security during start intermittently.

Anyone have this problem before or know what it might be? All connections were soldered in, none are mechanical.