To check for a sticky button, take a cell phone camera and point it at the front of the remote. You will see the IR flasher with the camera. If you see no flash, then you don't have a sticky button (at this moment) You will see the flash when you press a button. Keep checking from time to time to see of you indeed have a sticky button.

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#1 Trinnov Altitude 32-8-16, 271, 8000XE, 7200SEHC, 7200.2, Seaton F18, JL Fathom F113, Revel w990's, Kef R7, ATI 528 Amp, JVC RS4100K, SI screen. Roon Nucleus+, Eno AG, Eno M link, 218.
#2 Mark Levinson No5105, Ayre VX8 and CX8, Vandersteen Treo CT, Preamp varies.
#3 Meridian Ellipse