LOST COM PROB AS HANDED OFF TO NEXT SECTOR AND UNABLE TO CONTACT ASSIGNED FREQ.

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I WAS LEVEL CRUISE; AFTER CHKING ON THE FREQ WITH BUR APCH ON 135.05 WAS THEN PASSED ON TO THE NEXT CTLR. I THEN SWITCHED TO WHAT I THOUGH WAS THE CORRECT FREQ BUT WAS NOT HEARD ON THAT FREQ. I FINALLY SWITCHED BACK TO THE ORIGINAL CTLR FREQ BUT; DUE TO CONGESTED FREQ; I SWITCHED TO THE TWR FREQ TO GET THROUGH; WHICH I FINALLY DID. THE TWR CTLR THEN GAVE ME A DIFFERENT FREQ. I SWITCHED TO THAT ONE AND WAS GIVEN NORMAL VECTORS FOR AN ILS TO THE ARPT. EVERYTHING WAS UNEVENTFUL EXCEPT FOR A LOSS OF COM FOR APPROX 5 MINS WITH THE APCH CTLING FACILITY; NOT TO MENTION THIS WAS A SINGLE-PLT IFR FLT DURING WHICH RAIN; TURB; UP/DOWN DRAFTS WERE ENCOUNTERED. HOWEVER; AT NO TIME DID MY ACFT ALT VARY BY MORE THAN 100 FT. ARPTS IN THIS AREA ARE VERY BUSY PLACES AND COM IS VERY IMPORTANT TO KEEP THINGS FLOWING PROPERLY; AND AT THE SAME TIME; ALWAYS TO FIRST FLY THE ACFT; NAV; AND COMMUNICATE IN THAT ORDER. MAYBE ON SUBSEQUENT FLTS; IF THIS PROB SHOULD COME ABOUT; IT MIGHT BE A GOOD IDEA TO ALWAYS LEAVE ONE OF THE RADIOS SET TO THE LAST FREQ TO GO BACK TO WHEN THE FREQ GETS BUSY OR WHEN NOBODY SEEMS TO BE WORKING THAT FREQ.