Keeps crashing every 5 minutes
Its definitely a problem with your device i play it on android with a s888 holding up with 11gb of ram (extended 3gb + 8gb) perfectly fine
As Justarandomfellow says, this will be a problem with your device. Try turning it off and turning it back on again (I know this seems so meme-y but it legitimately solves 90% of reported problems).
I Play with a Samsung Galaxy a3 2016 si tu 1,5go of ram and i got 0 crash in 2h of gameplay