One trick that is subtle... IF you set a timer and limit the max events, then later change that... I'm not sure it automatically adjusts what you already have kept.
For example... IF you had set to keep 20... but changed it to 10... It will not delete down to 10 events... you have to do that manually I think.
Perhaps it works the other way as well? IF you set to keep only 20 events, then changed to ALL... perhaps it still is "stuck" at 20 for the existing ones?
Other than that... IF you have that much space left, it shouldn't be deleting old recordings to make room for anything.
For example... IF you had set to keep 20... but changed it to 10... It will not delete down to 10 events... you have to do that manually I think.
Perhaps it works the other way as well? IF you set to keep only 20 events, then changed to ALL... perhaps it still is "stuck" at 20 for the existing ones?
Other than that... IF you have that much space left, it shouldn't be deleting old recordings to make room for anything.