sudden crashes of my Quartus Prime during Synthesis/Fitter

During the implementation of my project from the Quartus Prime GUI (Start compilation), my tool sometimes crashes. A window opens with the message: "Quartus Prime Problem Report - Sorry! The Quartus Prime software quit unexpectedly.....". No specific cause of the error is given.

omething similar happens when I start my implementation from a TCL script. Here, I receive further information about the cause:

Internal Error: Sub-system: OPT, File: /quartus/synth/opt/opt_op_add.cpp, Line: 10225

new_iterm_a && new_iterm_b

Stack Trace:

    0x881bd: RTL_ADDER::shrink_iports + 0x28d (SYNTH_OPT)

    0x8794b: RTL_ADDER::create_binary_adder + 0x68b (SYNTH_OPT)

    0x830be: RTL_ADDER::restruct_adder_network + 0xefe (SYNTH_OPT)

    0x807e3: RTL_ADDER::aggressive_adder_balancing + 0xa3 (SYNTH_OPT)

   0x102356: RTL_SCRIPT::call_common_rtl_fns + 0x706 (SYNTH_OPT)

   0x104402: RTL_SCRIPT::call_named_function + 0x4b2 (SYNTH_OPT)

    0xff8fb: RTL_SCRIPT::process_script + 0x17eb (SYNTH_OPT)

     0x52b4: RTL_ROOT::process_parallel_helper_script + 0x2c4 (SYNTH_OPT)

    0x134f4: sgn_run_rtl + 0x194 (synth_sgn)

     0x41eb: qsyn_execute_sgn + 0x2ab (quartus_map)

    0x13fb5: QSYN_FRAMEWORK::execute_core + 0x1d5 (quartus_map)

    0x1378c: QSYN_FRAMEWORK::execute + 0x2ec (quartus_map)

    0x108ab: qexe_do_grunt + 0x10b (comp_qexe)

    0x16e90: qexe_run + 0x310 (comp_qexe)

    0x18012: qexe_standard_main + 0xb2 (comp_qexe)

    0x1b94e: qsyn_main + 0x55e (quartus_map)

    0x12208: msg_main_thread + 0x18 (CCL_MSG)

    0x13b18: msg_thread_wrapper + 0x78 (CCL_MSG)

    0x15f13: mem_thread_wrapper + 0x73 (ccl_mem)

    0x11a41: msg_exe_main + 0xa1 (CCL_MSG)

    0x2c957: __scrt_common_main_seh + 0x10b (quartus_map)

I might be that no error appears when I try again. What could be the cause?