WXPN Stopped Working on Sonos

This is an odd one.  I have listened to WXPN (U of Penn, Philadelphia) on Sonos for years.  Last week it stopped working on Sonos.  I am running S1with a variety of legacy and new gear.  

• When I start WXPN through TuneIn on a zone, the stream immediately flips from PLAYING back to STOPPED - every time I click PLAY it immediately flips to STOP
• Other stations work fine through TuneIn - WXPN is the only one with an issue (that I have found)
• Even sister stream XPN2 still plays on Sonos through TuneIn
• I went to a friend and saw the same behavior (also running S1)
• WXPN plays perfectly through the TuneIn iPhone app (not is Sonos)

I spent an hour on the phone with Sonos support (before our connection dropped)

• Running diagnostics (even run while trying to start WXPN repeatedly) the rep saw nothing odd that indicated an issue
• We tested WXPN through (Sonos) TuneIn, Sonos Radio and (Sonos Radio.Net) - all had the same behavior - clicking PLAY immediately flipped to STOP; all other radio stations through all 3 Sonos portals worked fine
• Rebooted FiOS Modem and all Sonos Zones, same behavior persisted across (Sonos) TuneIn, Sonos Radio, Radio.net
• When my phone connection dropped, the rep suggested I create an S2 network with  one piece of gear (Play:3) to see if the problem is an S1 issue - when the call dropped I gave up for the night (and didn’t create an S2 network)
• Before he dropped the rep said he would submit a ticket to the tech team listing a problem with WXPN, I need to call back and follow up

Anyone have any insights or advice?  Could someone running S2 try to play WXPN and see if it works?

Big thanks.

Jeff