We have FOP2 V.2.31.49 with FreePBX 16.0.41.4 and Astrisk 20.4.0
fop2.service restarted every 80 Seconds.
Every 80 Seconds FOP2 panel in user side will disconnected and after 5 seconds it will reconnect.
but every Caller ID in User panel will lost.

Dec 11 19:41:54 freepbx.sangoma.local systemd[1]: Starting Flash Operator Panel 2...
Dec 11 19:43:25 freepbx.sangoma.local systemd[1]: fop2.service start operation timed out. Terminating.
Dec 11 19:43:25 freepbx.sangoma.local systemd[1]: Failed to start Flash Operator Panel 2.
Dec 11 19:43:25 freepbx.sangoma.local systemd[1]: Unit fop2.service entered failed state.
Dec 11 19:43:25 freepbx.sangoma.local systemd[1]: fop2.service failed.
Dec 11 19:43:30 freepbx.sangoma.local systemd[1]: fop2.service holdoff time over, scheduling restart.
Dec 11 19:43:30 freepbx.sangoma.local systemd[1]: Stopped Flash Operator Panel 2.
Dec 11 19:43:30 freepbx.sangoma.local systemd[1]: Starting Flash Operator Panel 2...
Dec 11 19:45:00 freepbx.sangoma.local systemd[1]: fop2.service start operation timed out. Terminating.
Dec 11 19:45:00 freepbx.sangoma.local systemd[1]: Failed to start Flash Operator Panel 2.
Dec 11 19:45:00 freepbx.sangoma.local systemd[1]: Unit fop2.service entered failed state.
Dec 11 19:45:00 freepbx.sangoma.local systemd[1]: fop2.service failed.
Dec 11 19:45:05 freepbx.sangoma.local systemd[1]: fop2.service holdoff time over, scheduling restart.
Dec 11 19:45:05 freepbx.sangoma.local systemd[1]: Stopped Flash Operator Panel 2.
Dec 11 19:45:05 freepbx.sangoma.local systemd[1]: Starting Flash Operator Panel 2...
Dec 11 19:46:36 freepbx.sangoma.local systemd[1]: fop2.service start operation timed out. Terminating.
Dec 11 19:46:36 freepbx.sangoma.local systemd[1]: Failed to start Flash Operator Panel 2.
Dec 11 19:46:36 freepbx.sangoma.local systemd[1]: Unit fop2.service entered failed state.
Dec 11 19:46:36 freepbx.sangoma.local systemd[1]: fop2.service failed.
Dec 11 19:46:41 freepbx.sangoma.local systemd[1]: fop2.service holdoff time over, scheduling restart.
Dec 11 19:46:41 freepbx.sangoma.local systemd[1]: Stopped Flash Operator Panel 2.
Dec 11 19:46:41 freepbx.sangoma.local systemd[1]: Starting Flash Operator Panel 2...
Dec 11 19:48:11 freepbx.sangoma.local systemd[1]: fop2.service start operation timed out. Terminating.
Dec 11 19:48:11 freepbx.sangoma.local systemd[1]: Failed to start Flash Operator Panel 2.
Dec 11 19:48:11 freepbx.sangoma.local systemd[1]: Unit fop2.service entered failed state.
Dec 11 19:48:11 freepbx.sangoma.local systemd[1]: fop2.service failed.
Dec 11 19:48:16 freepbx.sangoma.local systemd[1]: fop2.service holdoff time over, scheduling restart.
Dec 11 19:48:16 freepbx.sangoma.local systemd[1]: Stopped Flash Operator Panel 2.
Dec 11 19:48:16 freepbx.sangoma.local systemd[1]: Starting Flash Operator Panel 2...