Doing a flight from GOOY to GATB, with a simple straight approach to RWY07.

First problem T/D appear and disappear both on FMC and track line.

But what is really weird is the glideslope pointer that changes all the time since descent from a negative vertical speed (-2100 ft/min for example) to a positive VS of more than 20.000 ft!!!

Of course aircraft begins bouncing its nose up and down.

Anybody else experiencing this?

I really like this aircraft but these kind of problems are disappointing me.

Schmid