This happend last week to. When you completed 2/3 waves it will freeze when 3th wave is active. This happens last week with the same Forge. Allot of people have addressed this on the forum and no respond was been made. Now hopefully this problem can be acknowledged. This happens on Xbox for me
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Same issue here. Played and got about 2/3 like you did and then bungie error: Guitar Needs to be fixed :/