It's happened to me as well.
I've got a couple clips of it happening. It's happened a couple more times on a different map with a different loadout, but i don't remember what that one was setup as.
PC specs:
Ryzen 5 5600x
rtx3070
32gb Ram at 3200 MT/s
on a SATA ssd
Loadout: GRT-BC , RO-M red dot, 30rnd Fast Mag, flash hider, red laser, basic barrel, and Ribbed Vertical grip
Mode: Conquest
Map: Siege of Cairo
Specifics 1: Was Holding on the A point. I was looking at the bottom right alley since enemies were going through it when it stared going on and off with the thermal sight through that red dot sight.
Specifics 2: Was holding on the A point. I was looking out the right side of it to stop the enemy team from pushing the point. After Sprinting to the place i started shooting from and aiming with that red dot it popped up briefly until I changed targets.
