At those figures you should be seeing around 20000 sync and 18000 profile. There is plenty of noise margin left but if external noise is causing the disconnects it will take time to settle.
Are there random noise bursts causing your disconnects? Download a copy of RouterStats Lite and run that with shortest update speed you can work with. Run it for two or three days and look to see what your noise figure is doing especially around the time of disconnect.
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