I've had that happen. An ffl buddy gave me some when it first came out. So I clean the M&P-15 and put on the frog.
It did fine for a couple hundred rounds, but then the gun started acting up. Cycling issues just as you mention...the gun had never done this before.
I check this and that, check ammo, mags, all the usual suspects. I noticed the charging handle was difficult to pull, so I take some of my petroleum base rod & reel oil and give it some drops. The rifle worked better, but wasn't cured.
That night I cleaned the rifle. I didn't really notice anything that stood out as suspect. But this time I went back to my R&R oil for lube. No more problems since then.
I think in my case the frog lube was compromised by the normal AR soot and became sludgy, because all this happened in warm weather.