I'd recommend you to answer @popatim's questions first. Then check the SSD manufacturer's website for any firmware updates on the model. I'd also check the drivers associated with the SSD in Disk Management and again make sure that they are updated.
Another thing you should try is testing the SSD's health and SMART data using a different diagnostic utility. Here's a thread with several suggestions: http://www.tomshardware.co.uk/answers/id-1926483/ssd-diagnostic-tools.html
I'd recommend you to answer @popatim's questions first. Then check the SSD manufacturer's website for any firmware updates on the model. I'd also check the drivers associated with the SSD in Disk Management and again make sure that they are updated.
Another thing you should try is testing the SSD's health and SMART data using a different diagnostic utility. Here's a thread with several suggestions: http://www.tomshardware.co.uk/answers/id-1926483/ssd-diagnostic-tools.html