Please review data

[Mouchet]

I notice my tiredness has started to come back this week.  The only problem I can spot is mask leak, which I have no idea how to fix.

I use airsense 10 with airfit 20 full face mask.  Sleep on sofa to avoid sleeping on back. Also use cloth protector on mask for comfort and leak.
Mask is less than 1 month old.
Based on data, what is the problem?

[Melman]

Have you read the mask primer? (See  the link below.) It has good information on dealing with leaks. Your apneas tend to be clustered and you had significant flow limitation early in the night on the 20th.  Both suggest positional issues. Sleeping on the couch may not be best. you may be tucking your chin towards your chest which narrows the airway and restricts flow. This can be controlled by use of a soft cervical collar.  It corrected that problem for me. It will be helpful in the future if you organize your sleepy head charts as shown in the link below. The pressure chart, which shows the pressure the machine is supplying at any given time, is of more value than the mask pressure.