I've had this issue since the last patch and other update file. Game load normally, runs normally, then total lockup for about 3 to 5 seconds. Resumes running normally for some random period of about 30 to 45 seconds, then the freeze again. This pattern repeats as long as the match is going on.
I've looked at any other changes and there are none. All other games, solo offline and MMO multiplayerr online all work normally. Naval action since the last update is the only one.