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PhoneBoy, thanks for your help and feedback.

The following parameters solve my problem:

:neo_implicit_disconnect (
:gateway (endpoint_vpn_implicit_disconnect
:default (true)
)
)
:neo_implicit_disconnect_timeout (
:gateway (endpoint_vpn_implicit_disconnect_timeout
:valid (true)
:default (0)
)
)

After configuring these parameters, the client switches within 3-5 pings. And everything would be fine if it was stable, some reconnections, say every third one (I didn't understand the exact pattern.), take more than a minute, although the break is recorded almost instantly.

What it looks like.

Fast reconnect:
1. The client records unavailability (1 sec)
2. The client initiates switching (1 sec)
3. Connect to the second provider (3 sec)

Slow reconnect:
1. The client records unavailability (1 sec)
2. The client initiates switching (1 sec)
3. Connect to the second provider (50+ sec).

Any thoughts on why random reconnection can last for so long? How to understand what is happening and what is the reason?

p.s.
TAC says the unsupported configuration and refuses to help.