Fenix 5x Plus freezing during workout

Got my Fenix 5x Plus two days ago. Easy to transfer music on it, the sound in my Jbl headphones is amazing, no problems with cutouts or interruptions.
Today at the gym, I had the Polar H10 connected (by the way, hope to see the disconnection issue with chest straps, in my case, solved in a future update!), the Jbl headphones connected and the strenght training started on the watch. After 24 minutes, the watch freezes and had to restart it. Immediately after the restart, the opened strenght training popped up, allowing me to resume it.
Anyone had this problem?
Used only with chest strap yesterday, but didn't have this problem, not even when I had only the headphones connected.