What filament do you use?- If its the snapmaker filament try to dehumidify it or buy a new spool from another company.
Try the temp tower under section 4, there is a gcode to run.- Please be sure to switch the machine off if there is a collision or something (no waranty for the gcode, but it worked a long time ago).
There should be some bridging parameters to set in cura, have a look about.
I use Simplify3d so no fast answer, sry.