On the Upper Thames on Saturday my 705 behaved in three different ways.
I set up the route on BikeHike, initially plotting the first section to Waterperry and saving it, then reloading it from disk and adding the last two sections. I saved it as GPXX directly to the device.
In use I had it beeping at me, and from the 2nd control onwards, had it powered from my battery, so the backlight was on all the time.
This is how it behaved:
1st Section - Perfect. All turns flagged up as I'd expect
2nd Section - Oddly annoying, was repetitively telling me to go straight on roads etc. Also wouldn't cancel an alert turn after I had passed its location
3rd Section - Almost no alerts at all. I had to keep an eye on the screen
I can't see how I can get three different behaviours from one file? In controls I locked the keypad, but that was all.