F5 HRM high pick every second day >240 bmp

From few weeks I have issue with high HR. Every second day I have very high pick more than 240.
Everyday when I wake up measure stress score and when I disconnect hrm tri and put on the table f5 show me short but very high pick. Do you know reason why and do you have similar issue?Do you have similar issue with f5? ciq.forums.garmin.com/.../1230577.png ciq.forums.garmin.com/.../1230578.png