A GA PLT RPTS INTERMITTENT OP OF HIS XPONDER DEPARTING YIP AND IN THE ZOB AREA.

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YIP TWR ADVISED NOT RECEIVING MODE C XPONDER READOUT. ON ARR AT AM00 LCL; NO COMPLAINT WAS RECORDED OR NOTED. XPONDER WAS CHKED AND FOUND SWITCH IN ALT CODE 1200. REPLY INDICATOR WAS FLASHING. YIP STILL CLAIMED NO MODE C. CHK WITH ZOB AFTER LEAVING YIP ATA INDICATED XPONDER WAS OPERATING PROPERLY INCLUDING MODE C. ON DEP FROM JACKSON; MI (JAN); AT PM00 LCL; CHKED WITH LANSING (LAN) APCH FOR XPONDER CHK. LAN RPTED XPONDER RECEIVED CODE 1200; ALT 3.5 -- CRUISE WAS AT 3500 FT MSL. CONCLUSION: THIS XPONDER WAS FUNCTIONING PROPERLY. NOTE: THIS XPONDER WAS RECENTLY CHKED BECAUSE OF SIMILAR COMPLAINTS AND FOUND TO BE PROPERLY OPERATING BY A REPAIR STATION. SUGGESTED CORRECTIVE ACTIONS: XPONDER INOP COMPLAINTS FROM DTW AND SATELLITE RADAR FACILITIES HAVE BEEN FREQUENTLY GIVEN TO NUMEROUS ACFT AT ALL TIMES. GENERALLY; THE NEXT CTLR DOWN THE LINE IS UNABLE TO CONFIRM XPONDER PROB AND RADIO SHOP CAN'T FIND A PROB. THIS WOULD SUGGEST THAT DTW RADAR HAS A PROB AND THEY SHOULD REFRAIN FROM ISSUING XPONDER PROB RPTS UNTIL THEIR GND FACILITIES ARE APPROPRIATELY REPAIRED/REPLACED. I HAVE DISCUSSED THIS WITH SEVERAL OWNERS AND PLTS IN THE AREA AND THEY ALL HAVE SIMILAR CONCERNS.