The root port randomly disabled and enabled time to time.

lee23425​ 

Spanning Tree Protocol (STP) provides network recovery by automatically recalculating paths and enabling standby links when an active link fails, ensuring a loop-free, redundant topology.

STP is used to prevent Layer 2 loops, commonly known as broadcast storms, from disrupting local area networks. STP virtually disconnects redundant links to prevent loops from occurring. 

By default, these (== virtually any smart managed or managed switch make and model) switches have all the same STP neutral  Spanning Tree priority 32768 configured - so the behaviour you see in your network switch logs is absolutely predictable.

While traditional 802.1D STP takes 30–50 seconds to converge, faster solutions like Rapid Spanning Tree Protocol (RSTP, 802.1w) reduce recovery time to about 6 seconds.

Newer switches are often defaulting to RSTP, allowing faster recovery.   

To avoid random SRT topology change messages (with the possible short traffic interruption),  actively configure STP/RSTP priorities and take over control of the root election. 

The lower the priority, the more likely the switch is to become the root bridge.

Normally have to do STP in increments of 4096 so you would not be able to allocate a priority of 1 to a switch.

By rule of thumb, a good start would be using lower numbers (== higher priority) on the switch nearer to the router, and higher numbers (== lower priority) on switches in intermediate and edge positions on the network.

A modest proposal for STP priorities, easy to remember, for a small network:

Router (assuming the router has multiple network "LAN" ports and allows the configuration of the STP priority)  0  <-> Core Switch 4096  <-> 8192  <-> Aggregation Switch 16384 <-> 20480 <-> 24567 <-> 28672 <-> Edge Switch 32768  <-> 36864 <-> 40960 <-> 45056 <-> <-> 49152 <-> 53284 <-> 57344  <-> 61440

Hope wally brain has the simple math right 8 -) )

If you can live without any STP based loop protection, disable STP/RSTP on all switches, accepting the risk of network loops - this brings down your smart managed switches network to about the level of a classic network, built on unmanaged devices however.

Some unmanaged and few smart managed switches optionally offer some alternate loop detection prevention method by transmitting certain specially crafted frames, where the switch can detect if the same frame does become visible on multiple ports.  

Enjoy, and welcome to the wonderful world of networking!