I've been getting a ton of complaints about that the last two days. I've contacted the bitsler admins to find out what's going on.
Please take a look at the same problem with nitrogen sports ... it´s almost impossible to use the bot with that site, it stops all the time
NitrogenSports doesn't allow being connected using a browser and the bot at the same time (you don't need to log out of your browser as far as Ican recall, but you need to close the tab). Are you opening NS in your browser to chat or play other games/bets while the bot is betting? Other than that, I haven't had NS stop yet.
Same thing with bitsler. If you log in to the site while the bot is betting, it's going to disconnect the bot.
Alternatively, are you on a stable internet connection?