Nozzle check would be a good starting point. If that shows fine, then run a check in service mode (quick google shold get you there), to double check red line is not on its last legs (haven't seen that happen thus far). Over the course of several football pitches of ipf ink, have not seen a bad Canon cart.
Silly questions:
1:What you've got printing pink, it is supposed to be red?
2:Replacement cart is genuine Canon?
3: 3 months is short enough to give your dealer a call, though if you've gone through the starter red, then you're giving the printer a fair work out, and have probably churned through most of the other channels, which suggests you know the answer to 1, and if 2 is yes, then your dealer should get him(her)self on speed dial...
Oh, as well as restart, try shut down, then pull the plug for 15 minutes - helps the old (new) girl lose her memory of past glitches.