Remove the lens, attach the old lens and see if you get the same issue, if yes, then you have an issue with the base, and will need to be take to a repairman. If no issues, then the new lens is having issues. Since its new, I assume to will have a warranty.
I have the same problem with the sony VCT R610, but these other solutions are talking about the 840...not the same I'd like to know how/where to get a quick release adapter also....for the SONY VCT R610
Most tripod heads are held on to the legs with 1/4" re 3/8" thread bolt - just grasp the legs firmly in one hand, the head in the other and rotate the head anti-clockwise.