I've had an Awair Element for about 16 months. The only time I've experienced what you may mean by "stuck" measurements was about a month ago, when PM2.5 was pu

I've had an Awair Element for about 16 months. The only time I've experienced what you may mean by "stuck" measurements was about a month ago, when PM2.5 was puzzlingly and worryingly at a consistently higher than usual level for a couple of days. Trial and error eventually suggested that there was a piece of dust stuck in the sensor or something like that. Upon blowing on the sensor, the measurement returned to normal.