I experience lost connection to the vehicle every now and then. I see a trend that it happens if the ROV is in stab mode or depth hold mode and the tether drag is sufficient enough to get the ROV out of level.
Switching to manual mode resolves this issue as no vehicle connection loss occurs in that mode.
I am sure that there is something buggy in the system that leads to this occurrence. The depth sensor may also go crazy showing depth like 8000m or so.
Hopefully, this can be looked into as when operating at a depth, let’s say following a cable, and the ROV blacks out for 10 seconds, you might not be able to relocate the cable again.
Can the heartbeat be set to more than 3 sec? Maybe that will help, but I doubt it.
In my opinon operational endurance is paramount. All warnings, alarms etc are secondary to operation.
It should always be up to the pilot to decide to call an “all stop” The little red warning triangle is enough to notify the pilot of any issues (and there is also audio). No shutdown/reboot or big on-screen display warnings should occur, ever!
Even if the water is pouring into the vehicle you might have to finish up a task. The last thing you need is distractions.