I charged Bob and turned in on and he immediately started going over the same spot and got stuck within the first few minutes. I tried again the next morning but I had to save him a few times and finally I got frustrated and put him back on the charging station. 
I was hoping to get a good one but I think it’s a 5050 chance, unfortunately. I am bummed because I’m going to return it and now I have to vacuum every other day with 2 dogs. Yay.