Clicking Play Again takes me to custom matches instead of the 3v3 lobby with my friend.

I haven't been able to find any particular consistencies for this other than it frequently occurs as stated in the title. After my friend and I finish our match I'll click play again which normally takes me and to the lobby of the 3v3 normal match and invite him to it, but instead a bug occurs that takes me to custom matches which I wasn't ever in, in the first place. (Custom matches game list)

Other reports: http://boards.na.leagueoflegends.com/en/c/bug-report/Wxp3guo8-play-again-button-after-aram-brings-you-to-custom-game-lobby

http://boards.na.leagueoflegends.com/en/c/bug-report/HsglAYAg-client-play-again-button-leading-to-custom-game-lobby-from-aram

http://boards.na.leagueoflegends.com/en/c/bug-report/uqWW3reo-client-pressing-play-again-brings-you-to-the-custom-game-lobby

http://boards.na.leagueoflegends.com/en/c/bug-report/ARUPwatb-client-hitting-play-again-after-a-butchers-bridge-game-brings-up-the-custom-games-lobby

http://boards.na.leagueoflegends.com/en/c/bug-report/NsvF1iBR-play-again-button-on-aram-still-goes-custom-lobby-occassionally

http://boards.na.leagueoflegends.com/en/c/bug-report/iEhqH2Fg-bug-play-again-opens-into-custom-games

http://boards.na.leagueoflegends.com/en/c/bug-report/Ihtn5AXF-party-play-again-opens-custom-games

http://boards.na.leagueoflegends.com/en/c/bug-report/IAgFQjQH-play-again-puts-players-into-custom-game-selection-menu

http://boards.na.leagueoflegends.com/en/c/bug-report/ZmtjQYfe-client-clicking-play-again-after-a-bugsplatted-load-on-a-ranked-game-sends-you-to-custom-lobby

http://boards.na.leagueoflegends.com/en/c/bug-report/fRz145KY-client-clicking-play-again-in-aram-with-party-sends-you-to-custom-games