Internet connection slows down in pacman

[armedan]

Whenever I try to use pacman to download new programs or update old ones, in recent times, my download speed quickly goes from being very fast down to a trickle on the very first download performed by pacman, up to the point when the speed is so small it must simply abort the whole thing. Any ideas or more information required to get your ideas going?

(just b.t.w. I'm using a raspberryPi)