1997 E300D Automatic down shift at low speeds

[briandownunda]

I have a 1997 E300D with 162000 original miles....the 5 speed transmission seems to shift pretty smoothly and works well most of the time.....the only issue I have experienced is, what appears to be an automatic downshift when slowing down to come to a stop.....at speeds around 15MPH. Is this normal ? If not, any ideas on what might be causing this to happen ?

Thanks in advance,

Brian