Hi my sd card is a sandisk M2 512 mb card and my problem is i was unable to put any video files larger than 40 mb in. If i put files that are for example 60mb in my phone it would transfer but stop around 1min and says cannot read source file or disk. But i was able to put files that are around 30mb and under. Is there a way i fix this or do i have to buy a new card.

TIA