I am not sure if it's video game specific.
Did you post other questions this week or only video games? - and if so, were they downvoted as well?
I posted no VG questions (not my area of interest/expertise - I have the whole tag on "ignore") but I had many of my own questions - both new and some old - downvoted, on average 3-4 downvotes a day, with at least a couple of times being obviously serial (e.g. today I had 3 downvotes in the space of several minutes) - none of them with comments. Since I've been active on this site, I have had my share of downvotes, but the last 2 weeks the volume was materially higher (both in # of DVs as well as percentage since I post less than average).
As others noted, you can't really demand explanations - while the SE spirit is that you should not downvote without explanation, the letter - for good reason - is that the comments for downvoting never were and never will be required (having experienced revenge downvoting on SO myself, I can see why that's not a bad policy).
However, something REALLY egregious is usually caught in automated scripts (MSO has details) designed to remove serial voting (the algorithm is secret but clearly takes >4 votes since none of my serial-downvoters were reversed so far on SFF, unlike on SO where someone's serial downvoting of me to teh tune of 8+ votes was indeed automatically cancelled).