Coreg CR and gp

I have been on Coreg for 1 year and switched to Coreg CR(time Release) for the last year. Since then, I have had bronchial inflammation that I have had to use antibiotics to recover from what starts out as a normal cold or flu. I have never had to use anything but over the counter meds in the past, and rarely got sick to begin with. This has occurred 3 times since Feb. My GP told me that this is a common side effect for this class of drugs. I work out 3 times a week and ride about 20 to 30 miles a week on my bike in addition and have had no other problems. Does this sound similar to anyone elses experiences