Weird performance from my NAS

[Goose]

I have a very simple single hard drive Xpenology NAS that i built a couple of years ago as a straightforward media storage/server. I've never had any problems until now.

Basically, if i try and copy a file from the NAS to me desktop PC the transfer speed is about 2mb/s.
If i transfer a file from my desktop PC to the NAS the transfer speed is about 100mb/s.
If copy a file from my NAS to another folder on the NAS the transfer speed is about 45mb/s.

In the last copy of weeks the NAS has suffered an improper shutdown due to power outages, could that have screwed things up?

Thanks

 

[Goose]

Ok so this is getting a bit weirder.

The 2mb/s speeds i get are when i simply copy and paste the file from the Mapped Network Drive in windows explorer. If i actually go in to the Synology UI, right click a file and select 'download' i get 100mb/s.

I have no idea whats going on.