Note: I don’t have an E-Bike Yet but I am an accomplished Bicycle Mechanic and former USAF Senior Technician on F16’s so I know a lil about troubleshooting.
You have had 2 issues so far with your E-Bike. Both of those could be related to something as simple as a loose connections. Have you looked at or checked these connections?
Is the LBS you had assemble the bike an Aventon Dealer? How much experience do they have with Aventon Bikes?
For the good stuff, you live in a Great Area for riding! I used to go down in that area for work related things and I had a storage locker where I stayed where I kept two of my bicycles. Roadie many of the trails in the Washington DC area. Of course that was back in the late 1980’s too! I sure hope you get things figure out so that you can enjoy those trails with a very capable E-Bike.