Hello:
Ok - I’ve got 1.1.4 installed on this unit, and will see what happens.
In the meantime - and incase it’s of use to see a comparison, just looking at another NAS (same model) that I look after, I’m seeing much lower memory usage (even with v1.2.1):
This unit has even more files, but only 12 shared folders and only 2 Remote Devices defined. Here is a heap profile:
syncthing-heap-linux-amd64-v1.2.1-140417.pprof (1.8 MB)
No offence taken if this is of no use! 
EDITEDITEDIT
Sorry - this might be useless information here. Some context:
- Although this Syncthing instance initially appeared to be running smoothly, I found one of it’s partners had stalled (as per Web based Syncthing not showing info - #33 by AudriusButkevicius ). Unfortunately I wasn’t able to grab a heap profile - but I was able to see the UI was reporting 6GB of RAM usage;
- I restarted this instance - it came back up as normal;
- However, at this point the NAS profiled just above here seemed to stall.
Unfortunately I haven’t got any logging running on these units so I can’t provide anything concrete at present.