Are there any BRRRR disadvantages

[Wesley Mitchell]

I was wondering what type of disadvantages or risks comes with using the BRRRR strategy? I own a home that is fully paid currently if i use that (HELOC) to pay for another which i then rehab, rent, cash out refi for another so on and so forth i will have multiple loans out at the same time. I understand if they are cashflowing the properties pay for themselves. Is the anything that could happen to stop the progress of the investments or worse cause it to stop or lose money? For example if the market crashes like 2008 is there a way that everything could be lost in one fell swoop? Or does the fact that you can sell the property counteract any and all problems that could arise?