I have played Bust-a-bit when I was new in cryptocurrency and the worst that I had come across so far was 5 streak in a row. I usually stop playing for a few rounds when this occurs. I tried figuring out when it usually occurs but I guess this is random since each run is generated by a random algorithm.
Also, martingale doesn't work long-run which everyone is already aware of. Have tried this several times before and if you will keep repeating it for the long run you will end up bankrupt.
when i was new on crypto i never tried bustabit but i have played a games simillar to bustabit . getting 5 streak loss is verry normal , i rememer i got over 10 red streaks when i set the payout to times 4 . the results are random but some says its on the seed that affects the game but im not convinced yet though i observed that red streaks come often after you hit alot of green streaks for a long period of time . try to keep an eye out of it next time you play and see if works on you too . lastly the martingale . well you need to have huge balance to make this effective in the long run and you better dont afk it because i think the system knows if your afk or not , and will give you tons of reds .