Inky Phat code crashes

Some issue with inky phat (BW version). RPI ZERO W.
I have it up and running, but it seems that code crashes occasionally (hours) to
Lines:
font1 = ImageFont.truetype(FredokaOne, 30)
font2 = ImageFont.truetype(FredokaOne, 26)

Gives OSE error, resource not available