failed in hash check

hi guys. a few days ago, my torrent started having a lot of ‘Downloaded piece #xxxx failed in hash check, 256 KB dropped.’ and not just a few. it occurs every few seconds. currently downloading 2 torrent and both of them are having this problem. at first when i started downloading the torrent, everything was fine.

during 2 hours of downloading, it already dropped more than 1GB of data. the bigger torrent already dropped 12GB of data during 1 day and 4 hours of downloading.

can anyone help explain how this could happen and is there anything that i can do to fix this. really need help here. a simple and short downloading has turned to long and painful.

any help or tips would really be helpful.

What is “rubbish data” and why am I downloading so much of it?