ASUS - ZenTalk

Hi pons.goz
Thank you for your asking. Have you ever dropped or broken the device? Kindly try some at-home troubleshooting tips below:
1. Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check any disturbance from installed 3rd party apps.
# How to enter and exit "Safe Mode"

[Phone] How to Enter and Exit Safe Mode? | Official Support | ASUS Global2. Please check on SMMI test 
Calculator> type ".12345+=">SMMI TEST>Single Test>Wide-angled Camera Capture Test/Tele Camera Capture Test/Front Camera Capture Test
If any of the SMMI tests fails, indicating high possibility of faulty hardware.
3. Also, please try "the Factory Reset" 
Settings>System>Reset options>Erase all data(factory reset)
**Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.
[Phone] How to back up the data stored in your phone ? | Official Support | ASUS Global
If the situation remains the same, according to what you described, please contact ASUS repair center in the country of your residence: https://www.asus.com/support/Service-Center-All-Countries/
If it is impossible to access the service center during Covid-19 period, please try CallUs: https://www.asus.com/support/CallUs
**Please backup before you submitted to the repair center.