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Possible reason: One of the centrald is in a HARD OFF state. This can happen if the rts2 system is stopped and restarted. Solution: change the state of each centrald using rts2-mon, pressing F9 to access the menu on the top of the screen and changing state to On.
Many underlying reasons can cause a mount to stop tracking, in some cases it can be fixed by simply reenabling it. Diagnostic: rts2-mon section corresponding to the mount (e.g. T0) variable TRACK = 0 Solution: Change variable to 4, observe that it is not changed back to 0.