Lights on Dimmers occasionally flash

I have several Red Series 2 Dimmers, and a Fan/Light Dimmer. All of them have the same issue of every now-and-then (maybe every couple minutes?) the light will flash. If the light is on a low brightness, it will flash bright and then go back to what it was. If the light is on a high brightness, it will flash dim and then go back to what it was. Red Dimmers are on Firmware 1.48. Fan/Light is on Firmware 1.36. Drivers are all latest according to Hubitat Package Manager. One Red dimmer is non-neutral. The rest have neutral. None of my dumb switches have this issue (I have no dumb dimmers). Thoughts?