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5GHz Wi-fi download speed dropped significantly after flashing build WW_17.1810.2003.145

Star I
Hi all,
I have flashed with the latest build WW_17.1810.2003.145 yesterday and found out the terminal download speed using 5GHz WiFi has gone down from 500Mbps to ~100Mbps.
I had my other iPhone 11 Pro as a control test which gives a steady 500Mbps download speed.
This fix was supposed to optimize the WiFi ironically.
Has anyone got similar experience?
Kind regards,

Rising Star I
i noticed the same thing after the update. my download speed has been cut in half over 5ghz wifi. upload speed remains unchanged.

Star I
Also, when moving away from my WiFi router the phone is not able to switch to the 2.4GHz channel but still camping onto the 5GHz, since the signal is too weak so it shows "Obtaining IP address" without an active connection.
I have to power cycle so that it knows to camp on to the 2.4GHz channel.
I'm using Netgear RAX20 WiFi router with smart WiFi turned on

Rising Star II
Please fix switching from 5 to 2.4 GHz and vice versa. Zenfone 6 is not able to switch swiftly it disconnect with '?' Sign on wifi icon i have to switch it off and on again. i never had this problem with my previous phones also other devices including phones in my home is also working properly. The router i am using is mi router pro AC 2600 ut is powerful router with very good range still zenfone 6 having issues. Problem was there in previous firmware too. Did not check speed issue.

Star I
My Phone is ASUS ROG 2. Having the same problem here. 2.4Ghz connection is working well. 5Ghz download speed only clocked in 2Mbps but normal upload speed. Other devices running well in the 5Ghz wifi connection. Please advise with solution.