Tempo sync problem with boss 505

Hi guys hope you can help, just got this problem after using OK for a year… Boss 505 mk1 looper out to the in on BB still starting and stopping perfect but BB is not recognising tempo now, and is playing at it’s own chosen speed change song on 505 and patten on BB still random tempo, can anybody help please

BB playing random tempo, but stopping and starting with boss 505 as normal suggesting that receiving signals OK, but tempo goes up n down, BB plays fine without midi cable in, and seem loop pedal has no issues Help???

Even though slightly different contents, the subject is the same so I merged your first and second threads. Please follow forum guidelines and don’t duplicate threads. Appreciate your understanding.