I have ran into this before however I can now confirm what is going on. My LPP started beeping at me today and I was like great its going to be an infinity. Sure enough about 75 yrds behind me I see a black infinity. So I waited around for awhile, and the guy would not pass me to save my life so I just turned the LPP off to try and restart it. No go it would not turn on for anything.
So I just slow down to about 40MPH before the ahole would pass me and as he got closer the V1 started alering to laser.
Once he passed me I turned the LPP back on with no problem.
Then thankfully he finally turned off up ahead.
Is there any possibility the LPP was tripping off his cruise control?