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Many issues after OTA FW update to ver. WW-32.2050.2050.29

Star III
Please tell us some basic information before asking for help:
Model Name: Zenfone 9, 16 GB RAM, 256 GB 
Firmware Version: WW-32.2050.2050.29
Rooted or not: NOT
Frequency of Occurrence: every few minutes
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
Last days I got OTA update to FW ver. WW-32.2050.2050.29
After that I instantly could observe the issues like below:
·       1) the battery is discharging much faster,
·       2) the WiFi connection goes OFF in 50% cases after screen goes off,
·       3) The camera anti-flicker option is no longer handling my light environment at home,
·       4) I observe few apps (Whatsapp, Loxone, 9gag, mydealz) hang up from time to time and need to be killed and started again to bring them into operation again
·       5) the fingerprint does not work stable like before,
·       6) the phone does not wake up instantly or not at all in 30% of cases when pushing the side button
The issues are annoying me terrible since about 1 week.
Which things I tried to solve the issues:
·       a) trying to use different battery modes,
·       b) clearing app's cache and in the end fully removing and installing them again,
·       c) removing fingerprints and adding them again
·       d) resetting the wifi/bluetooth settings
and because all of above has not helped:
·       e) I made hard reset 2 times already, once per phone settings, once via Recovery Mode
And still my problems remain unsolved!
I am getting crazy, because now I am fully disappoint how the phone works.
Until the mentioned FW update all was working really good, I was really happy with the phone and its performance as well with the battery life.
I really doubt, that there is a way to solve my described issues.
This is why I think the downgrade to previous FW ver. WW-32.2040.2040.23 is the only possible solution. I tried to do it, I have searched how to do it, but I could not find any FW package, which allows the downgrade procedure.
Can someone help me with the downgrade?

Star III
After customer service contact I was advised to create RMA, because HW malfunctions are expected...

Hey @Leschek,
Do these issues continue to persist after installing the latest FW?

Star III
Hello @Mansi_ASUS
I have sent the phone to Asus service, so I had no opportunity to try the new FW.
But I am pretty sure that all of these is caused by SW bugs, because as mentioned, before updating the phone I have not seen any problem.
Yesterday I got an email, that the phone arrived at Asus service, so they have started checking it.

Star I