Random restarts during activity

Hi,

I've experienced two restarts during activities now. Both Garmin Coach activities, one was high speed intervals and one was an easy, slow-pace run. Watch says it's on firmware 17.28 (which it says is up to date). In both cases, the watch showed a screen with "Epix" simply written across it for about 20/30 seconds and then immediately returned to the paused activity. The data from the run suggests that the watch captured the whole run (it shows 30 minutes total), but the laps show only 15 minutes of time - 15 minutes has just disappeared.

I should be able to provide details from both activities in question.

Jamie