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I think this is because every time you change what you are holding (including the quantity) whilst mining blocks, it resets the mining process. For example try mining something with your hand and then change to something else while you are mining the block. I am pretty sure this is not a bug and is intended, even if it is annoying 
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Can't believe how fast I rushed through making this, but I meant what Tyler said in MC-2588 in the comments. If the quantity of the item (the one you are using to break the block) changes midway through breaking a block, the progress resets. (eg. the first block breaks, and you dig the block behind it (with same block as the one broken). Then the new (broken block) adds up to your stack, updating the number, and thus the progress repeats. )
Also the progress can reset on servers if the lag is severe enough that the durability of a tool changes after the block broke. (The damage value on the tool is changed, since in the previous report they said that the bug was fixed so that progress resets while changing blocks/ same block but different data value.
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