DS Problems Slot 1 not working

[Dsaray]

hey fellas ive got 2 of the older ds's here which dont read slot 1 games anymore, they have worked fine for over 1 year and started playing up, they both have had r4's in them for about 6 months, know what happens is when i figit around with r4 i get it to load and all of a sudden they freeze, is their a easy fix for these or just toss em out and get a ds lite?

[Mysterex]

is it only happening with the R4 cartridge or does it do it with other game cartridges as well - sometimes the R4 needs padding (paper or thin cardboard)behind the PCB to slightly raise it up so it makes reliable contact with the pins

otherwise check for bent or misaligned pins inside the connector

if ok - try cleaning the copper contacts of the slot 1 connector

what version R4 - if its the older ones that came with both white and brown coloured cases you can use the spare case, open it up and put a rectangular piece of super fine grade wet and dry sandpaper with some thin cardboard behind it to space it out

insert and remove several times to polish the connectors

failing that i can replace the slot 1 with a new one, or fit a replacement board

regards...

[Dsaray]

it does it with other cartridges as well, its a grey cartridge