I rarely experience connection problems, but for the last couple of days I've noticed some severe server delay for certain functions; using the XP Fish in the sewers, opening a chest, visiting the Sticker Shop, and s few other things which require the game to talk directly to the servers seem to be experiencing a really long delay before they execute.
To me this is indicative of a high server load being caused by some various reason, a server failure which is adding stress or a connection bottleneck somewhere.
I haven't experienced any problem with Ops besides the occasional long delay in joining a lobby.