System freeze and forced shutdown when running multiple sessions under heavy use (Mac M4)

Environment

• Machine: Mac M4
• OS: macOS
• Usage pattern: Heavy use, multiple concurrent sessions

What happens

Under heavy use with multiple sessions open simultaneously, the system frequently freezes completely, requiring a forced shutdown (hard power off). This is not just the app becoming unresponsive — the entire machine locks up.

Expected behavior

Multiple sessions should run without causing system-level instability. At worst, the application itself should degrade gracefully rather than freezing the OS.

Suspected areas

• Memory leak across concurrent sessions
• Zombie / orphan processes not being reaped
• Resource contention (file descriptors, CPU, or memory) under parallel workloads

Additional context

This is reproducible under sustained multi-session usage, not a one-off occurrence. Happy to provide additional diagnostics (Activity Monitor snapshots, ps output, system logs) if helpful.