SMA PLT ON IFR TAKES PRECAUTIONARY EVASIVE ACTION TO AVOID A TWIN CONVERGING AT HIS SAME ALT. ATC HAD TRIED TO CONTACT HIM WITH AN ADVISORY.

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I LAUNCHED LATE DUE TO RESOLVING FUEL PROBS. AFTER OPENING IFR WITH FNT APCH; I WAS INFORMED THAT THE PROPOSED FLT AT XA00 HAD EXPIRED. I WAS GRANTED AN ABBREVIATED CLRNC. AFTER XING FNT; CTLR GAVE ME A 1 MIN RPT THAT AN ABBREVIATED CLRNC HAD NO PLT DATA. I PLANNED TO GIVE PLT DATA TO FSS WHEN I CALLED FOR PIREP/WX. I HEARD NO FURTHER CALLS WHILE COMPUTING WIND. APPROX 2 MINS LATER (8 MI W OF FNT) I SAW A TWIN(?) CLOSING AT MY ALT; NWBOUND. I IMMEDIATELY BEGAN DSCNT AND OTHER ACFT IMMEDIATELY BEGAN ASCENT. IF I HAD TAKEN NO ACTION I WOULD HAVE PASSED BEHIND THE OTHER ACFT. I CALLED FNT TO CONFIRM CONTACT AND WAS INFORMED THAT I HAD MISSED CONTACT; I SUSPECTED FIXATION ON COMPUTING WIND AND/OR RADIO MALFUNCTION. I HAD NO FURTHER RADIO TROUBLE; SO FIXATION IS MOST PROBABLY CAUSE. DURING THE NEXT 30 MINS; I CONCENTRATED ON MY SCAN AND RADIO LEAST THE PROB REPEAT. ABOUT 20 MI S OF UXN AT 10 DEGS; MY CABIN DOOR POPPED OPEN; THOUGH IT WAS CHKED LOCKED AND LATCHED BEFORE FLT. I RPTED THE PROB AND REQUESTED LNDG AT ADG. FOLLOWING A PERSONAL RULE THAT CONSIDERS 3 ANOMALIES AN ABORT CONDITION; I TERMINATED FLT AT ADG; ATE LUNCH; AND TRIED TO CALMLY START FROM SCRATCH BEFORE FLYING TO DEST GSO.