Update: As stated, wireless charging quit on my L950.  I used the Nokia DT-900 charging plate successfully with it for over a year and it still works fine for the Lumina 920.  MS tech support said to try a hard reset to fix the problem.  Well I did; and it didn't!  Next, they said to send the L950 in for repair.  Instead, I bought a new wireless charger ($19.99) along with a 2-watt power adapter ($8).  That solved the problem.