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Disk full message for /var/lib/docker/overlay2/

i am running my docker based application in ubuntu 18.04 and after few hours i get message during file operation saying cannot create temp file for here-document: No space left on device
checked with df -h and found the disk is 100% full with
overlay 58G 58G 0 100% /var/lib/docker/overlay2/xxxxxxxxx/merged

checked docker system df. it shows 3.7GB.
current workaround is when i do reboot, the issue resolves. and after few hours of operation the disk again gets filled.
docker system prune does not help.
Can you please suggest on this issue?