The 713+ works fine until RAM is exhausted. Then Roon is not accessible anymore. But also the 713+ NAS isn’t responding except on a ping. A hard reset is the only way out. Then RAM is back to 10% and everything is fine. This takes about 2 days before all memory is occupied.
Looking at the specifications for the 713+ NAS it’s way under spec to have a good user experience running Roon.
I believe it comes with an ATOM CPU and only 1GB RAM.
How much RAM is fitted in your 713+?
Google suggests it’s possible to increase to 4GB which may help, however, the ATOM CPU is still quite slow but at least 4GB might help to extend the life of this unit.
UPDATE
Just read your other topic, looks like you have 4GB RAM already but no SSD.
I know you don’t want to hear this but it’s time for new hardware, sorry.
I installed a 500gb ssd on my synology 713+. The usb version. After that I reinstalled the latest core version on the NAS.
Now since about 5 weeks the system runs as never before. Not one drop out. No delays. Very responsive. No reboots any more.
Just wanted to let you know.
Regards Jan