Hey, I am also new to BTT and was having the same issue. But after reading through older forum posts, I changed some settings and since today morning, I don't seem to have the issue. So, perhaps you can try this too....
- From the Apple menu bar, open BetterTouchTool > Preferences
- Under Standard Settings > Basic > General section, enable 'Launch BetterTouchTool on Startup'
- Under Standard Settings > Touch Bar > Advanced tab, set 'After sleep, wait before reinitialising Touch Bar' to, say, 2 seconds. It is 0 by default. This is the most important setting, which solved the problem.
- Under Advanced Settings > General stuff section, enable 'Restart BTT after wake from sleep'