Is there a fix to Win 10/Lumia 550 hotspot issue

[Windows Central Question]

Lumia 550 with W10 provides bluetooth connection for my TomTom Go40 for about 5 minutes. Then, without fail, the link is dropped because the phone has turned off the tethering. I click on the blue square and we start the cycle again. I have found no way to prevent this happening. Help me avoid crashing my car!