just one question, before the wild ideas 🙂
how did you detect this problem ?
can you reproduce it with your drivetest MS ?
does this problem impact any kind of MS ? or just a specific brand ? or just the “DTM” MS ?
1/ the MSC is paging a MS with a TMSI that the MS has forgotten -> check if there is such a timer in the MS ? decrease your T3212 or increase the t_purge in the vlr
2/ the paging request is sent to the wrong LAC, and the second IMSI paging is sent to more LAC’s, including the correct one. -> check your LAC definition in MSC ?
3/ paging sent in the wrong paging group (air interface)
4/ … i’m out…