Halo false alarms

Hi all, I have been using ST since March after having Iris for a few years. Wondering if anyone who still has Halo and Halo+ smoke detectors has experienced false alarms of “elevated smoke detected?” I’ve had this happen 2x recently with different Halo devices, both times overnight. I have no idea why this is happening. Ultimately, the announcement clears within a minute. Aside from this issue the weather announcements work well. I migrated to ST to hopefully avoid having to replace these smoke detectors…