Blocks not mining in minecraft v 1.7.10?

Just redownloaded minecraft, v 1.7.10, started up the game and started to hit some trees only to find that once i mine the block it doesn't disappear for a minute. Sometimes it doesn't disappear at all, and i have to mine it again. Sometimes it disappears if i hit it once after "destroying" it.

what's up with this glitch? Is there a fix? Any help appreciated

Are you playing on a server or on single player?

If it is a server then it is a bad connection between you and the host, it can either be your internet (what is your download speed) try resetting your router, if that doesn't fix it then it is a bad connection on the servers side.

If you're in single player then you will need to dedicate more RAM to it -

Just play minecraft 1.7.9 its the same but without some little minor glitches.