@vliah Same thing happened to me recently, I posted it here: https://community.justflight.com/topic/10047/finally-got-an-ils-issue/5. It hasn't reproduced since I uninstalled the kln90B, tho I did not have it loaded into the aircraft and I don't understand why having the unit installed would cause this issue... It is also generally good practice to enter HDG mode before intercepting a localizer.