Throttling issues INN

[Avon]

Can someone please help guide me as to how I can fix this error?

Mode: throttled (loadav [innwatch:hiload] 2366 gt 2000)

The INN2 server I am running has been doing this on/off over the last few days.
I found there was a large cleanfield log file that had taken up some HDD space and removed it then restarted the server.
It seemed to have cleared the issue but 24 hours later it seems the problem is back.

Looking at the server logs from the last 72 hours I see

Jun 14 15:20:10 news nnrpd[15661]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15663]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15664]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15662]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15665]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15667]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15668]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15666]: load 28.59 > 16
Jun 14 15:20:11 news nnrpd[15669]: load 28.59 > 16

In the last 24 hours I see

Jun 15 00:08:03 news nnrpd[2699]: vorlon.activateit.net.au rejected tests
Jun 15 00:11:28 news nnrpd[2877]: mtrlpq2314w-lp130-06-70-55-78-6.dsl.bell.ca rejected tests
Jun 15 00:11:38 news nnrpd[2884]: mtrlpq2314w-lp130-06-70-55-78-6.dsl.bell.ca rejected tests
Jun 15 00:11:49 news nnrpd[2889]: mtrlpq2314w-lp130-06-70-55-78-6.dsl.bell.ca rejected tests
Jun 15 00:12:00 news nnrpd[2910]: mtrlpq2314w-lp130-06-70-55-78-6.dsl.bell.ca rejected tests
Jun 15 00:12:11 news nnrpd[2962]: mtrlpq2314w-lp130-06-70-55-78-6.dsl.bell.ca rejected tests

What is causing the load to go so high? The system has been running fine for over a year with the odd restart

Any help appreciated 😊

Best, Paul