Hi all,Can anyone please help, my problem is that when I capture the glide slope from underneath at correct speed, flaps etc, as soon as the aircraft is locked on and tracking the GS, it drops out and the green app light go’s out on the MCP and will not reactivate. I have to fly the approach manually, this is not a problem in its self but this dropping out can’t be right. I have searched this forum and have read all the posts on glide slope issues but can’t find an answer to my problem. All my instruments are set correctly as far as I am aware. I have ‘GS on’ selected in the FMC, the correct nav frequencies are selected, I have no problems capturing the localiser. Also I have the correct runway listed in the routes page under departure / arrivals, I even have the runway elevation set on the overhead. So have I got something wrong or is this a problem that will be sorted out with service pack 1. I do not have this problem when flying the ifly 737ngx. This happens on different approaches and is not subject to a single airport. Many thanks for any help received.Paul Breeze