i see "connection error" and the bet are stopped. This for me is the most risk of martingale choice (later stopped i have lost last 8 bet)
Having a bad connection is not a risk at all because you could roll it manually again starting from your last wager amount. Even if your connection is decent and you could roll the next one without any issue, there is still no guarantee that you will win the next one as you could suffer another loss thus keep on doubling your wager amount
I would never play with martingale not even if you pay me to do so.
Why wouldnt you do such an easy things for free money? *sarcasm* you could easily set up a bot to roll it in less than 15 seconds