I keep mine in my left pockets. For a while keeping it in my back left pocket, which is apparently closer to the sensor and for about a week I got no warnings. Then they started happening regularly again. I tried my left front pocket and for a few days I got no warnings.. then started getting them again.
I notice that if I have my phone with my keyfob, both in the front left pocket.. I never get the warnings. It's like my phone is signal boosting the key fob. It's the weirdest thing.