Fenix 5 - Firmware 19.10.0.0 - Battery Drain + Calendar

I have firmware 19.10.0.0 instaled on my garmin fenix 5 since 27/03/2020 and battery use, was fine.

2 weeks ago i started to use marathon trainning in exercices, so they (the exercices) migrated to calendar and to my fenix everytime i sinc.

Can the battery drain be related to the use of garmin calendar? Because the battery just started to drain in this firmware since the last 2 weeks...

Please advice, can that be a bug?

Should i do a soft reset? And shall i loose settings ou activities if i do it?

Thanks