David B. From United States of America, joined Jun 2001, 3148 posts, RR: 5 Posted (13 years 9 months 1 week 2 days 18 hours ago) and read 3950 times:
Yesterday I was flying a ERJ-145 from Lax to Huston. I climbed to FL360. The plane all of a sudden for no reason started to bank from side to side. What was causing this? There was no user input. My guess is that the air was too thin up there to support the aircraft at that speed (.70). Anyone else have that problem? Or have I exceeded the ceiling? I did not receive a warning.