It seems that every night I lose MLAT, the button on flightaware.com turns red, and then it comes back on by itself. Usually around 2AM the clock becomes unstable, with the occasional recovery. By 5:30 or so all is back to normal. Below a graph of aircraft seen with MLAT in black. Occasional MLAT planes overnight but largely quiet. The bump in activity between 4 and 430 is common.
No big deal that it disappears and reappears. Is this MLAT behavior normal? Anyone else see this?