Flashing "M" and "S" loss of power
 

Very new to forum I have been reading threads and found several interesting things. There were a couple of threads on this issue but not sure if they apply to my issue.
I have disco II '02. While driving, I will come to a stop and the "M" and "S" flash and I loose power it is very slow to accellerate. Turning off the vehicle and restarting seems to fix it for the moment. Please advise. :o

First have your battery and alternator teseted.
Is your check engine light on?

How many miles on your truck? As Spike mentioned, go have your battery/alternator tested, low voltage, from a failing battery or dirty cables, can cause this and will get so bad that you may not be able to drive the truck or only drive in limp mode.

I had the battery checked and the altenater checked last summer. They were all good. I will get those checked again. It happens more often in the warmer months.
68,000 miles.

It happens more often in the warmer months...like when the A/C and headlights are both on?
Alot can happen in a year.
Car batteries only last 4-5 years.

Get your system rechecked again cause if it isn't this than you have a major problem and you don't want to be driving the truck.