I only have the standard charging cable, but I'd have to assume there are similar spring-loaded contacts at the bottom. Make sure no contacts are stuck in the depressed position. Also, try gently cleaning each contact with a pencil eraser, and while you're at it, also clean the contacts on the pager.
Yeah, that's actually how I solved a different problem... The first amplified charging cradle that I bought would fail to grab the RX audio from the pager (audio would still come out the pager's speaker rather than the cradle's front speaker or audio connector on the back). The green "pager" light on top of the amplified cradle also wouldn't light up anymore. After "exercising" the springs in each of the contacts and cleaning them off, that problem went away.
For those scoring along at home: I now own (3) amplified charging cradles. #1 is currently in service (the one where I exercised/cleaned the pins), #2 has the "out of range" problem, and #3 is brand new, in the box for when #1 finds a new way to stop working. Hopefully there's a solution to fix the "out of range" issue as well, so I can have that as the spare for when the current in-service unit develops a problem. ;-)
(...and yes, I never declare a charging cradle as OOS until it fails the same way with both pagers for at least 12 hours, and I verify with a few other people that they're not seeing any problems with the VHF trunked system I'm monitoring.)