Thanks. I cleared the WASM folder last night per the advice of AI. I'm now in the midst of a 6-hour cross-Atlantic flight; so far, OK. This is the issue: with this plane, you often have time committed to long flights, and when a WASM crash happens deep into a flight, it is very upsetting and shouldn't happen. Anyway - let's see if it performs now. Is this something I need to do now as part of periodic maintenance to prevent future crashes?