>>Just a SWAG, but the problem may be that a Win95 box is becoming the Master Browser for your network. There are known bugs with Win95 boxes acting as Browse Master; I've mostly seen it in misconfigured NT domains.
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>>You might try setting the Browse Master options of all Win95 stations on the net to 'Disabled' and make the Win98 box the Browse Master (set it to 'Enabled' rather than 'Automatic' to avoid pointless negotiation.) If any NT box is available, Workstation or Server, make -THAT_ the Browse Master for the network.
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>Actually, if there is a PDC, it will always be the browse master. In 95 the browse master selection is in the file and print sharing section. I agree that should be disabled. It could also be a flaky: card, cable, hub or even damaged dll on the workstation causing the problem.

What's a PDC? Another TLA?

Cabling and other is surely not the matter, we reproduced the behavior in our office. The cables are brand new and have been thoroughly measured and tested; besides, there's the 15 year guarantee we give on them (to ourselves, too), and, anyway, any other communication in the network works excellent.