Spent multiple hours running around Titan opening chest and at one point the chests stop giving the tokens. Had this happen multiple times. Opened at least 20 chests then went to cash in and only registered 9 tokens.
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This can happen if you are just running around collecting materials and opening chests. I've heard there is a cool down after opening (I believe) 5 chests/materials within a 4-5 min span.