AK in the blinds.

[EsandWhizz]

Im in the blinds with AK, cut-off or button raises 4xbb, i assume its a positional raise (i play 50nl 6max) , i reraise 4or5x his bet, he flat calls. Im now oop and if it misses the flop im in trouble. This seems to be a problem i keep encountering. If i bet 3/4 pot when i miss on a non-threatening board i often get flat called again or reraised and then im in a big pot, oop and holding A high. If i check the flop a decent player will bet out and im lost. I see it as weak not to reraise with AK in the blinds but the money im losing with it in the blinds is ridiculous. Any help please.