I can also say that on my phone, that even with stock recovery and relocking the bootloader, the OTA update still seems to cause 4G/Wifi to stop working. After looking at the firmware.zip file, the update is trying to update the boot.img. My guess is that it's failing to flash the boot.img due to s-on flag thus the patched system files aren't compatible with the old kernel (since it failed to update the kernel) (boot.img is the kernel I believe) thus things like 4g/wifi stop working.
But even with the bootloader being relocked ota updates seem to still fail on updating the kernel. My guess is because it's not "factory locked" anymore. Notice when you lock the boot loader, it will say "relocked" in the hboot screen. Which I do recall being different then just "locked" when you first get the phone from the store.
It may also be that your stock recovery is too new. Do a google search and find the "leaked" firmware update to get the "original" recovery.img that came with the phone. The one I uploaded was ripped from the latest OTA update and thus it may be different then the stock recovery that was shipped with the phone.
Also one idea. notice how the contents of the firmware.zip in the OTA update appear to be the same in structure to the
PH44IMG.zip we use to flash things to the phone via hboot.
Try putting the boot.img file from the update into the above zip file and flashing it with hboot AFTER you do the ota update and have unlocked the bootloader again. Be sure to grab the boot.img from the leaked ics rom so that you can go back to the true stock boot.img the phone shipped with incase you run into problems with the new boot.img.
(with boot loader unlocked of coarse). Do this even if you already have CWM installed. You probably can't flash boot.img by itself due to s-on. If hboot is able to do it, then you should be able to get the correct version of the kernel installed and the 4g/wifi issues should be fixed. I think the phone is using the recovery rom when it's trying to flash the boot.img file. Perhaps hboot will be successful instead.