SO, to get rid of this problem, i will tell u all on how to cleaning the GBA catridge in a simplest way.Are you ready??
First of all,u need:
# a can of compressed air
# cotton swab
# small amount of water
# Paper towel
Step-by-step instruction:
1. Spray compressed air into cartridge to remove excess dirt and dust.(but dont spray to close as u might damage the catridge)(spray 1.5 inch away from the opening)
2. Dampen one end of a cotton swab.
3. Remove excess water with paper towel.
4. Clean opening of cartridge and connector pins with damp cotton swab.(Gently rub the connector pins with a side-to-side motion.)
5. Flip over cotton swab and dry connector pins.
6. Let cartridge sit for 10 minutes.