Looking at the information provided it appears some kind of interference.
That CCQ will be the reason your radio data rate is only running 180/180
You can try and see if its channel congestion or some kind of environmental factors (body of water, etc)
Have you tried other frequencies?
CCQ is a measure of the quality of the radio link for exchanging information, you need traffic on the link to cause it to test the CCQ but if you have got up to 180/180 I would guess you have data on the link.
Let us know about how other frequencies perform and any information about the link / environment and we may be able to advise.