Removing Implant by Minimal Reverse Torque?

Dr. I asks:

Can a dental implant that appears both clinically and radiographically integrated be removed by minimal reverse torque?

The reason for my question is that recently I have experienced a number of failures with a particular implant. Prior to using this implant, I had experienced about 2% failure rate. In this particular case I placed two implants in the maxillary first premolar area, when the implant placed in the # 5 site failed shortly after loading (the implant appeared both clinically and radiographically integrated), I removed the crown and abutment from the implant in the # 12 site to see if I could remove by applying reverse torque using the manufacturers ratchet and with slight force I was surprised to find the implant began to come out.

I did not think this was possible, but may explain the high number of failures I have noted since using this implant. I have since stopped using this implant, but worry about the twenty implants from this company that I have already placed. The patient in this case was a healthy 70 year old female, implants were placed in native bone D3 and given a full 6 months to integrate before uncovering. At the time of uncovering no crestal bone loss was noted. Radiographically it appeared that bone was intimately adapted to the implant body the full length of the implants. Any feed-back is appreciated. I am not sure how to proceed.