For root partition yes, call support but for all others you should have a control of the disk space usage. Also advising you to upgrade your device at least to 7.0.9 as per release notes and addresses issues:
I have this issue happening on a 5060 using 7.1.8. I've had TAC clear it up but its back today. I'm unsure if this a root file doing it though:
show system disk-space
Filesystem Size Used Avail Use% Mounted on
/dev/md3 3.8G 3.4G 246M 94% /
/dev/md5 7.6G 2.8G 4.4G 39% /opt/pancfg
/dev/md6 3.8G 2.9G 772M 79% /opt/panrepo
tmpfs 2.0G 116M 1.9G 6% /dev/shm
cgroup_root 2.0G 0 2.0G 0% /cgroup
/dev/md8 198G 135G 53G 73% /opt/panlogs
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