We have noticed that the sudden drop in the ranking for domain xyz.com on 24-May-2020. Due to technical glitch the loss of 301 redirect from old domain XYZ.in to main domain xyz.com redirect was implemented last 3 years ago one to one URL.
After working a couple of hours, we found the domain XYZ.in showing 500 Server Errors due to this 301 get lost. We have corrected the 301 as it implemented previously and in 24 hours ranking gets retained. Just after 2 days, we have lost the ranking again. Our team has checked everything is working fine still ranking is not retrained on its position in SERP. Kindly share solution on this