I got M visa , need some advice

Hi, i got 1 year M type with 30 days per stay multiple entry , and i'm planing to stay around 6 months. so will be any problems to go out mainland for example HK, Macau or jinmen to activate another 30 days and re-enter in the same day without any problem or they will ask and suspect why i'm doing exit and re-enter at same day because it's obvious i'm doing this for activate another 30 days. i hope to find someone had this experience before :)

Thanks