One of the biggest mistakes I see is people allow their Bermuda lawn to get TALL and too high. Bermuda grass should be kept about 1″ tall for most lawns. If you are having issues with scalping and uneven spots, raise the height slightly but not over 1.5″ if at all possible. In times of extreme drought and high heat, you can also take it to 1.5″ to 2″
Keeping your bermuda grass tall will also cause fungus and disease during warm wet periods. Yes, it’s OK to give it a SCALP once and bring it down to the right height. Just do this after a heavy rain and bag your clippings.