I would respectfully suggest that the fault doesn’t lie with the A&H equipment, because the set-up worked as required ‘yesterday’. We occasionally have minor problems, but it’s almost always TCP/IP or wireless router-related, which isn’t A&H’s fault.
We are looking at much heavier ethernet cables, with proper shielding, even though we don’t generally do cable runs through the audience area, or to a FoH position. Normal CAT5 cables are very fragile (IMHO) and it’s very difficult to test on the job.
Good luck, and keep the faith! 
