HI all, I have the same problem here, My Homey has been for a week at athom for investigation but they did’n find nothing.
So as far as i could i debugged it by myself.
I disabled all apps , and every day i enabled one app at the time and every hour i checked the memory,
I found out that the HTTP reqeust flow app was the cause.
So after that i checked my flows that using the HTTP request app.
I have 8 flows that runs every 10 seconds for checking status of light (on/off).
After that i disabled all that flows and no memory leaks anymore.
Now i have changed the time for the flow to 30 sec, normaly my homey was online for 1 day now its 3-4 days.
With the HTTP request app i send a simple request and getting a JSON response, filtering it to JSON path and set a variable in the better logic app.
Somehow the response is writing in to memory and causes the fault.
The whole problem with some screenshots and logfiles is send to homey support last Tuesday, they send me e mail that is under investigation by there developer team.