Yes, happening to me too. It has nothing to do with my internet or bandwidth. Every other channel & app (including the ESPN app) work fine. It's only ESPN on Hulu. Anyone from Roku have any comment on this? It's really annoying. Also, these constant issues with NBA broadcasts is getting old. TNT had big issues only on Hulu last season!
Its most likely the ESPN feed itself - even with linear MVPDs (with re-compression) the quality is normally poor - with YT TV and watching MNF this season, the quality was abysmal at times, with bitrates often dropping down to 1-4Mbps (compared to 20-60Mbps for most content).
In contrast, today's Wildcard game - co-broadcast on ABC - was very clear with none of the "normal" visual degradation seen on ESPN/ESPN streams - at least OTA on ABC (I didnt watch it via YT TV or the ESPN app, because of the quality issues with ESPN/ESPN streams).