There are a number of things you can eliminate that might be causing drops in connection...
With just the phone plugged in,do you have any noise on the line?
If you have a SKY box,make sure it's filtered
Try to connect at the master socket with all non-bt wiring and apparatus disconnected-check if you have a'splittable' socket and connect at the test socket visible after you have removed the lower half of the faceplate ..
Do the 'drops'coincide with any 'timed'electrical equipment-central heating,street lighting etc
Try swapping your microfilters around-only connect 1 at a time (no other phones etc plugged in)
Hope this helps
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