WWE legend Scott Hall's emotional reunion with his estranged son at the end of ESPN's documentary about the wrestler was short-lived -- sources tell TMZ, Scott's drug problems have once again forced the two apart.

In case you missed it, ESPN aired a heartfelt documentary about Scott Hall last night -- chronicling the wrestler's drug-fueled fall from grace -- in which Scott and his son Cody poignantly reunited after not speaking for years.

The documentary ended on a promising note (below) -- with the father-son duo working together to launch Cody's wrestling career.

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But Scott's ex-wife Dana tells TMZ, the reunion in May barely lasted a month -- and once again, the two are no longer on speaking terms.

We're told Cody gave up on his dad due to "constant verbal abuse from Scott while he was binging" -- and he soon moved back home with his mom.