M4300 Connection Issue

Good Afternoon,

Been having an on going issue at one of my customer sites.

The problem i am having is devices loosing connection to the internet. I have found initially that the only way to fix it was to perform a "clear arp-cache" So i thought that manually adding them in would solve the problem. I have found that unplugging the ethernet cable and plugging it back in seems to fix the issue? But only for a short duration few hours to minutes

I have approx 40 total devices with only 5 of them requiring internet connection. I have found that once the internet drops off a device i am unable to ping it from the switch via CLI.

The router we have onsite is a cisco 2901 configured and talking to the internet ( I'm able to ping google etc )

Any help is appreciated

I have manually added ARP Entries into the switch

I am unable to ping the relevant devices from the switch.

I have upgraded to the latest firmware.

I will attach a running config file.