Really? Like always? You think maybe the first few minutes after a new troop goes on sale might be especially hard on the servers? Everyone is frantically connecting to the shop over and over again to buy troops; then they're connecting over and over again to the servers to contribute to guild tasks, which are at their cheapest and so cycled the fastest. Then they're opening dozens or hundreds of chests, then they're leveling new and old troops with all the stuff they just received.
It sounds very reasonable that the servers would take a pounding at this time of the week.