Flying approach ILS, lowering landing gear causes change from GS to Pitch Hold on PFD
Been flying the Q400 for years, and thousands of flights. I just noticed the other day that sometimes I will be seeing LOC and GS on the ILS, and all of a sudden GS drops out and Pitch Hold appears on the PFD. Pressing the APP button, changes it back to GS. I found a couple of videos on youtube of the Q400 flying on the ILS, and I noticed on one of them, that when the landing gear was lowered, the PFD instantly went to Pitch Hold from GS. The pilot hit the APP button again, and the rest of the approach was normal.
I then found a discussion this morning on an AVsim thread on the Q400, where two pilots mentioned the same thing ( old thread dating back to 2013. ) https://www.avsim.com/forums/topic/410880-speeding-down-the-glideslope/?do=findComment&comment=2705396
My question is, has this been happening all along and I just noticed it, or is this something in the programming of the Q400 that causes landing gear deployment to activate Pitch Hold? If so, is there a reason for that?