Radio blasting static every time I turn the truck off or back on

I have a T680 with a DEA500 radio with Bluetooth. I listen to music or podcasts from my phone using Bluetooth. Every time I turn the truck off or disconnect my phone from the Bluetooth the radio automatically switches to WX or FM and it stays at whatever the volume was set at on the Bluetooth channel. So usually it's just static. So every time I'm listening to music pretty loud if I turn off the truck when I turn it back on it blasts static through the speakers and I have to turn it down. Is this just a design flaw of the radio or is there a way to avoid this besides turning down the volume every time I turn off the truck? It's not only annoying but I'm pretty sure it could blow the #### speakers if it keeps doing that.

 

Yeah I can switch to R AUX before I turn the truck off. I do that sometimes, but it's easy to forget. A lot of times when I stop I just turn off the truck and get out without thinking (especially when I gotta piss).

I think I will get an aftermarket even though it's a company truck. If I leave the truck I'll put the stock one back in. Can I get an aftermarket radio that plugs right in without having to mess with wiring?

 

Wait, so you're saying if I just keep an aux cord plugged in it won't do it anymore?