Not sure about your BT, but your screen button issue may be related to my issues.
TLDR: 3 ribbon cables converge in one stress point, the assembler has to battle to get it all together and can easily damage something else like the lcd ribbon cable, and it’s all held together with a sticker.
I am having issues with the display and button and can say the construction is unfortunately really really bad. Like way more bad than I expected for DIY Sparkfun type products. After a day of excited ownership, I noticed the screen was flickering, and the button seemed temperamental. I realized the screen would get too dim to see except in the dark, and the button flipped between either not working, or I would think it was not working and because of the dimming problem I couldn’t tell it was turned on.
I decided to take a look inside. Umm, it’s bad. The sticker overlay you see on the front is all part of the button. Behind it is a display board and display that you cannot get to unless you remove the sticker button. The display board has 3 fairly crappy ribbon cables all jammed in that one spot, and it’s all sort of held in place with the sticker. The LCD is floating off the display PCB and connected to the PCB with a ribbon cable bent flat and soldered crooked. Now here’s the best part, there are two ribbon cable connectors of the same size, one to connect the display to the rest of the components for data, and one to connect the button sticker. Although the connectors are the same size, the ribbon cables are totally different in pin count and thickness (one inserts as it should, one is too thick, the contacts span maybe 2 pins each, and it requires some force while the LCD is dangling off the PCB).
On my unit, I see lots of signs of struggle the assembler had with putting it together, especially with the too thick ribbon cable. The tip of the sticker ribbon cable has the leads already pretty worn off where it was probably inserted over and over to get it to work, and scratches on the cable itself where it might have been forced with pliers. It was clearly a challenge for the person to get it in there, and I think said person perhaps ended up fudging the already crooked and dangling lcd ribbon cable which is not easily serviceable. The end of the button ribbon cable was so worn I could barely get it to work by reinserting it. I had to trim the end to get it to touch undisturbed contact points.
I seriously think whoever assembled my unit remembers it. It was likely a battle. I think they all might be given the choices in assembly design. It’s kind of cute what they did, but why?? There are so many button choices and better ways to connect components together.
I am contacting customer support as we speak. I don’t think you should have to go to a forum to get a defective product replaced when it’s so poorly designed and put together.