Game continues to 'validate' on steam

[2nd_TAF/602Sqn_Puff]

Been trying constantly since the last update and have deleted the files in steams 'downloading' folder and still the game will update and then sits for hours validating....its gets close to 90% and then goes back to the start and validates again, anyone else suffer the same and if so have they found a fix for this?

[2nd_TAF/602Sqn_Puff]

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