The van goes into posi-traction mode on its own, in dry roads.

What is your question?

My NV1500 has 420,000 miles on it. It had been a great vehicle. But it drops into positraction mode, slows down and has no power in dry conditions. The only way to clear it is to shut off the van and re-start it. Sometimes that won't clear it and I have to unhook the battery to clear it. Why?

What makes this problem better or worse?

It's just so sporadic.

How long has your 2014 Nissan NV1500 had this problem?

A couple months