Home Sharing is not working following update to iOS 5.1 and iTunes 10.6

Question

First, the problem:
I am not able to see any shared libraries  when using the Music and Video apps on my iPhone 4.
Next, the specs:
iTunes 10.6 on MBP running Mac OS X 10.7.3
iPhone 4 runinng iOS 5.1
Wi-Fi connections for both MBP and iPhone 4
Both connect to same network using same SSID with static IP addressing and UPnP enabled.
MBP connects using 5 GHz N-Only anntena.
iPhone 4 connects using 2.4 GHz NG-Mixed antenna. (Hopefully next iteration of iPhone supports 5 GHz.)
Third, what I have tried:
Everything in "Troubleshooting Home Sharing" (KB Article TS2972 - http://support.apple.com/kb/TS2972).
Re-entering my Apple ID credentials for both Music and Movies in iOS Settings.
Re-entering my Apple ID credentials for Home Sharing in iTunes.
Setting up Port Forwarding for both the iPhone 4 and MBP in my router for the relevant TCP and UDP ports (just in case). However, this did not help.
Finally, what I have noticed:
My Remote app on the iPhone 4 works without issue and can control iTunes running on my MBP.
My Air Mouse app on the iPhone 4 works without issue and can control my MBP.
My wireless printer connected to the network via the 2.4 GHz antenna (it only supports 802.11g) is usable - I can print to it and access its embedded web server management tool.
So, in the end, Home Sharing no longer works on my iPhone 4 after updating both IOS and iTunes (all other apps and software updates are current for both the phone and the MBP). I believe I have ruled out any issues with which antenna is being used for which device. I am out of ideas on how to get Home Sharing to work again.
Any suggestions or possible solutions would be greatly appreciated! Thank you gurus in advance!

Answer 1

Spoke to a "senior advisor" in the Apple TV department.  Her suggestions:  change channel in router to minimize/eliminate wifi interference from other users; move router away from any metal - i.e., DVD player, phone modem, etc.; keep router away from wireless 2.4 gH phones, which are "notorious" for crashing wifi routers.  So she confirms that the problem is one of connection to router suddenly dropping out.
My own feeling is that none of these fixes will do the trick, because it seems pretty clear that there is a hardware component here - the timing of the drops seems like an overheating issue.  It takes 35-40 minutes for the box to warm up enough for the first drop; then each consecutive drop happens quicker than the one before, as it heats up more.  Each time it drops, its tiny brain gets a little more scrambled; last night it finally wouldn't start up again at all.
My suggestion is that everyone who is experiencing this problem, please call Apple tech support and ask to speak to a senior advisor in the Apple TV department.  Make them aware of this problem!