Would be interested to hear what the doc said about your problem. I´ve been walking 4 miles a day, 5 days a week and running/walking another 4 miles per day for 3 days a week (i.e. sometimes I workout 3 days per day). Anyway, I have the same issues with only 1 of my guys and can't find any good answers as to whehter I should be concerned or not...