Can I get the output of AdminCP|Maintenance|Activity Maintenance|Configuration diagnostic, please?
I expect that it's a problem with the code for the postbit "Alternate position"; try setting it to "Default position" and see if the problem persists. Also, a sample postbit source when the problem is happening may be useful (or the source for the whole page). If "Default position" doesn't work, you can set it to "None," which completely removes the JS from the page but leaves everything else enabled, until I figure out the problem.
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