STUDENT PLT FAILS TO HOLD SHORT OF A RWY DURING TAXI TO PARKING DUE TO LOST COMS.

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AFTER COMPLETING MY 300 MI XCOUNTRY SOLO FLT (FROM INT- FLO-DAN-INT) I WAS ON THE GND AT INT TAXIING BACK TO HANGAR ON A TXWY WHICH TOOK ME BACK ACROSS RWY 15/33. ALTHOUGH I HAD NOT HEARD ANY HOLD SHORT INSTRUCTIONS; I STOPPED; TRIED TO TALK TO TWR; LOOKED FOR LIGHT SIGNAL TO ALLOW ME TO PROCEED. I DID NOT RECEIVE ANY LIGHT SIGNALS FROM TWR. AFTER MAKING SURE NO OTHER ACFT WAS APCHING I EXPEDITED MY XING OF RWY 15. AT THIS POINT; LET ME INFORM YOU THAT I HAD BEEN EXPERIENCING INTERMITTENT RADIO COM PROBS; WHICH I INFORMED TWR OPERATOR ABOUT AFTER I MADE FIRST CONTACT WITH HIM. AFTER PROCEEDING TO CROSS RWY 15 AND TAXIING TO HANGAR; I MANAGED TO RE-ESTABLISH COMS WITH TWR OPERATOR AT WHICH TIME HE PROCEEDED TO 'CHEW ME OUT ROYALLY;' SO TO SPEAK. I ONCE AGAIN INFORMED HIM OF THE PROB I HAD BEEN HAVING BUT HE WAS NOT PLEASED. I'VE LANDED AT THIS ARPT 100 PLUS TIMES BEFORE AND I'VE ALWAYS COMPLIED WITH INSTRUCTIONS I RECEIVE. UPON INSPECTION OF RADIO EQUIP IN ACFT AND UPON MY HEADSET; IT WAS DETERMINED THAT MY COM PROB MORE THAN LIKELY WAS CAUSED BY A LOOSE CONNECTION (WHICH HAS BEEN CORRECTED) IN MY HEADSET. I DID NOT HEAR THE HOLD SHORT INSTRUCTION.