Wireless Frame Retries
The percentage of frames retries exceeds the value set in Expert Thresholds. A certain background number of frame retries are normal in a wireless environment. A massive flood of such retries could indicate a problem, however.
An unusually high number may be the result of:
Too many APs competing for the same channel.
Signal strength problems; perhaps you need more APs to cover the area in which people are attempting wireless access.
Signal quality problems due to RF interference (metal walls, cordless phones, microwave ovens, etc.).