I sometimes get this problem, try loading up mw2 going into a pregame lobby then loading mw3 some how dont ask me how it makes the connection better on mw3 even puts strict nat type to open. so try tht and also use force host eboot make an eboot using iMCSx eboot tool its easy just tick the boxes and click 4.xx if on cfw 4xx+ and click create new eboot make sure u change the 9 to 8 in the above bles region before u create new then its done just tick super jump, speed and otherthings you want ok so please go here dont forget to drop a like for iMCSx for the tool {
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if your getting maps errors simply instal pkgs 1.19 to 1.21 and then 1.24 {1.22 & 1.23 are not needed to fix this error}. hope these work for you.