maybe you should be pointing your miners at a pool?. i used to solo mine spreadcoin when difficulty was like 30 times lower
 but once difficulty got too high i went to nicehash pool mining to ensure regular payouts.
not sure what your hash rate is but when solo mining make sure
the difficulty isn't too high for your hashrate. otherwise the luck factor can really affect profits. (though in theory over the long haul
it should even out)