Hi, I have recently noticed that all menus are slow after boot up of receiver.It takes about 15mins after boot up for menus to operate?

I have noticed this in the last few flash

My current image is 5.0.011 and its still occurring

RAM
Total memory: 309044
Free memory: 86244
Buffers: 2144
Cached: 46580
Total Swap:0
Free Swap:0

Flash
Total: 442.1m
Free:320.1m

Any ideas on what going on?
Is it possible to upgrade the ram and what type do I need and the max it can take?