How to check an unmanaged switch?

Question

Computer networks

There is a simple unmanaged 16 port D-link DGS-1016A switch. During operation, there are constant glitches, hosts connected to it may not see each other, while there is a link, file transfer sometimes becomes very long for no apparent reason, etc. Reboot helped. Now there is another switch in its place and everything works fine. In this regard, the question is:
How can you generally check unmanaged switches for malfunctions and glitches? What are the means for this, etc.

Answer 1

D-link

throw it in the trash and do not buy these products again.
Here is your future hero:

Answer 2

You have already checked it by replacing it with a serviceable one. Everything else to check in the form of network analyzers is unreasonably expensive for such a piece of iron.

Answer 3

You have already carried out diagnostics "in battle" - the result is that the switch is buggy.
But options are possible, of course. It may not be the switch itself that is buggy, but, for example, in conjunction with some client or some port of the switch lags. Maybe you just have such wild traffic on the network that it can't cope.
I mean, you could go deeper.
Connect this switch to what is now instead of it and stick clients into it one at a time, after each connection, give time to work, watch the process. If everything is fine, connect the next client, and so on. If lags start somewhere again, then try to plug the last connected one into another port, if the plug does not help, try taking another one instead of the last client. This way you can localize the problem a little. Such experiments may take time, please be patient.
If it turns out that the problem is in the port, then simply do not use this port, if in the client - change the client's adapter or transfer to another switch, if it does not work - divide the clients into two switches. Something like this.