Operate the box on a 634er Panasonic TX-model. The S92er Box doing very well at TX, the 4K is excellent. Unfortunately (and inexplicably) Amazon has the S92 but not approved Prime Instant Video for his (the TX contrast, already), which in turn Instant Prime's 4K is still not on the TX is streamable. In addition, the pre-installed menu of S92 more than spartan, but Google Play is for it.
Update: ****** Solution for instant video problem with the S92: [...]