Mark wasn't alone. On the forums—DPReview and Fred Miranda—users were lighting up the threads. "Why does my buffer clear so slow?" "Why does autofocus hunt in low light?" "Error 99 strikes again."
Even though the 40D is a legacy DSLR, firmware updates provide vital stability fixes: canon 40d firmware update
In those days, a firmware update wasn't a seamless over-the-air download. It was a ritual. Mark wasn't alone
: Corrects a low battery indication error when using the EF 85mm f/1.2L II USM lens. canon 40d firmware update