From what I gather, no concrete solution has been found so far, nor why it's even happening, and Nintendo hasn't said much about it. Seems like it's pretty common too unlike the already solved Joy-Con problem. Naturally this is highly concerning for me (as it should be for everyone really) since the main reason I'm buying a Switch is for Splatoon 2. Even if I get lucky and my Switch turns out to be fine, others may not be and so there'll be frequent lag and drops ruining the experience.