Originally posted by PointClick anyone else having the same problem? hard to imagine why.
Verry odd.
You can be sure (well, almost
) that Pentax tried SDM+OGPS1 before shipping.
So, you have a warranty issue and should contact Pentax to get it fixed. It may be both, OGPS1 or DA16-50 which cause the trouble.
E.g., OGPS1 drawing too much current (like with a partial shortage) or DA16-50 being on the edge of things needing full power to work w/o fail. You may try with another power source (e.g., a 6 AA grip).