Wireless link test-reg

hi sir, we have to using cambium 450i for ptp link last 1year going to properly but now  we have to facing wireless link issue...give any suggestion..

we have to using channel width 30mhz and 40mhz at same time wireless link come

If I understand you correctly, your PTP 450i link was working well for 1 year, but is now suffering poor performance. 

This would suggest to me that an interferer has arisen.  Can you do a spectrum scan at both ends to determine if the channel you're using is clear?