DMP 4400 will quickly flip every other image. Why?

So we have several DMP 4400s installed and managed through the DMM.  Often some of the DMPs will start flipping quickly past every other image in the playlist although they are all timed to change at 25 secs or so. All images in the playlist are png.  When first uploaded the signage will behave normally and then for no apparent reason they start with this issue.  The problem does not occur on all of our DMPs and will occasionally appear to correct themselves.  We have seen the problem in both 5.2.1 and 5.2.2 firmware versions.
If we use Flash the problem does not appear however it is time consuming to update all of the DMPs and can not be done quickly.
Has anyone seen this and can you offer a solution?
David

So we have several DMP 4400s installed and managed through the DMM.  Often some of the DMPs will start flipping quickly past every other image in the playlist although they are all timed to change at 25 secs or so. All images in the playlist are png.  When first uploaded the signage will behave normally and then for no apparent reason they start with this issue.  The problem does not occur on all of our DMPs and will occasionally appear to correct themselves.  We have seen the problem in both 5.2.1 and 5.2.2 firmware versions.
If we use Flash the problem does not appear however it is time consuming to update all of the DMPs and can not be done quickly.
Has anyone seen this and can you offer a solution?
David

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