That happened to me once!! I uninstalled and reinstalled and it fixed it!! Im pretty sure everyone is obsessed with the Cha-ching! They should never get rid of it!!
Both my hubby & I have it - they usually echo each other when it ♪♫cha-chings♪♫. We haven't had any problems. Have you checked that the option is turned on under settings?
I miss the ching too:( Disappeared when I was forced to switch to the new app, so I can't blame Android. No remedy I guess, but nice to know I'm not alone here.