My car is possessed, please help me.

Hello all,

I have an 06 Subaru Legacy 3.0R Spec B called Astrid. 😍 but she has a concerning issue, the handbrake will at random times just disable itself. There could be between a day or weeks between this occurring. It's happened maybe 6 or 7 times now. Usually it disables itself about 2minutes or so after it has been applied.

Thankfully 🤞, everytime it has happened it's happened on flat ground or only a moderate slope where I could save her causing me large expense. She's a tad clumsy. 🤦‍♀️

The first time it happened I damn near sh*t myself, I was completely alone in my car, legs spread out on my phone when suddenly the hand brake lever smacks me in the knee with a loud *thunk* 

Can someone help me dispossess my car please? 😐

With this being my fourth Subaru, I just kind of think of it's quirks and minor nuisances as character, but I think this one will need resolving...