EDIT: Seems to be working again now. Probably just a temporary, unavoidable glitch. Would still appreciate knowing more about why this may have happened :). That, or walking over to the window had some magical effect. Who knows?

Had a rather unpleasent experience today: normally I can get 3G in my office (11th floor of a building on Lambton Key), and I had it earlier this morning. All bars, so good reception. Occasionally shows HSPA coverage.

Anyway, all of a sudden, I can't get 3G coverage. Whenver I try, I just get a "No Service" Message. I'm using a Palm Treo Pro, running Windows Mobile 6.1. If I select Auto/Auto for Type/Band, I get GPRS coverage. :(. If I select GPRS/Auto, same thing (duh :)). If I select UMTS/Auto, I get nothing. UMTS/2100MHz, I get nothing. Auto/(GSM 850MHz/1900Mhz, UMTS 2100 MHz) I get nothing. I did get 3G coverage back briefly, but couldn't get a data connection active, so there wasn't a lot of point :(.

Does anyone have any idea what's going on here? Hopefully I'll still have 3G coverage when I get home... If not, it may be something wrong with my phone.

For reference, the phone has Quad Band GSM and Tri-Band UMTS (850MHz, 1900MHz, 2100MHz).

EDIT: And I get GPRS coverage, instantiate a data connection, and it tells me I have 3G, but then suddunly dies and I have to force GPRS. :( Not impressed.