i am guessing this is WiFi ?
Frame retry usually means that the frames have been corrupted, due to some sort of interference, and needed to be resent. The maximum number of retries is then used and you get the first error. The speed then backs off, which is a built in method to mitigate this type of problem, but it persists, and you get the second error.
Have a look for interference sources, where this equipment is located. Microwave ovens, video senders, anything that operates in the 2.4GHz band.
You should try to get a copy of the manufacturer’s manual, and I am sure these error messages will be explained in there more fully. If you can’t find them, post the manufacturer and model number here and we will see if we can help further.