Did you try the steps discussed in STUCK at ---[precice] Synchronize participants and close communication channels - #6 by zjk2549514878
What happens if you set a CG solver in the parameters.prm file on the deal.II side
--- a/turek-hron-fsi3/solid-dealii/parameters.prm
+++ b/turek-hron-fsi3/solid-dealii/parameters.prm
@@ -40,7 +40,7 @@ subsection Solver
set Model = neo-Hookean
# Linear solver: CG or Direct
- set Solver type = Direct
+ set Solver type = CG