Yes, having parallel lines before splitter does cause frequent disconnections- especially if one is idle for sometime while typing some long mail, etc and reduced download speeds!!
One of my friends had this issue!!:no:
For single wire, multiple parallel connections(provided u have existing parallel outs in every room or where needed)-
(1)Connect mainline into house into the splitter first (using RJ-11).
(2)If the MTNL/BSNL line enters your home right near ur PC, u r lucky, else ask the MTNL/BSNL guys to provide extra length of usual tel wire and route the first connection to your room or wherever the modem will be installed.
Using another RJ-11, connect the phone out from splitter to the wall socket!!
so you still get your parallel lines, w/o any parallel lines before splitter to disturb the ADSL signal!!
Luckily my friend had a loom of parallel connections in his concelaed wiring- say foresight on his Dad's part years back!!
So it was much simpler for him,
though main line was not in his room, he already had mainline into one line feeding other phone sockets in other rooms- connected that line's out in his room to splitter provided with ADSL modem/router-
phone out on splitter to another wall socket in his room, so it became line in for other 3 lines!!:S