I accidentally happened upon the reviews for these wicks today. I have been using these wicks for quite some time with no issues. Around December, I too started experiencing tunneling with my candles and have had several customers return them because of it. In October/November I switched from GB464 wax to GB444, I thought this might be the issue and was thinking of switching back, until I saw the reviews here. I have ordered a different brand of wick and will give those a test. I wanted to post my issue just so it is stated that someone else is having the same problem.