[SQU] Authenticators busy?

I have an authenticator (squid_rad_auth)
I works (alomost) allright:

It gives the OK's and ERR's from the command line.

But.... After a couple of hours all my authenticators are busy (see log)

I do not know if this is a (IEX5) browser thing, a squid problem, or an authenticator problem:

The squid_authenticator from cachemgr.cgi:

Authenticator Statistics:
number running: 32 of 32
requests sent: 666
replies received: 642
queue length: 0
avg service time: 151 msec

# FD # Requests Flags Time Offset Request
1 21 31 AB 17453.716 0 HJSIETEMS IIJERMO\n
2 22 6 AB 17153.353 0 HJSIETEMS IIJERMO\n
3 23 109 AB 14556.162 0 ikleberg@ahrend.com 750739\n
4 24 201 AB 13481.726 0 aoppaurom WELKOM\n
5 25 4 AB 13473.418 0 ikleberg@ahrend.com 214323\n
6 26 54 AB 9469.457 0 ahrend IIahrend183\n
7 27 2 AB 9432.611 0 ahrend ahrend183\n
8 28 8 AB 8812.550 0 rtijssen repro\n
9 31 9 AB 8677.360 0 rtijssen repro\n
10 32 40 AB 7354.309 0 ahrend ahrend183\n
11 33 28 AB 3899.534 0 mennes copa\n
12 34 8 AB 3581.733 0 mennes copa\n
13 58 11 AB 3067.329 0 mennes copa\n
14 61 5 AB 2730.561 0 admin nidetnet\n
15 63 2 AB 2700.786 0 admin nidetnet\n
16 64 13 AB 2169.028 0 RR RR\n
17 66 3 AB 2167.957 0 RR RR\n
18 68 10 A 621.896 0 (none)
19 69 1 A 2166.799 0 (none)
20 70 0 A 115202.020 0 (none)
21 72 0 A 115202.020 0 (none)
22 73 0 A 115202.020 0 (none)
23 74 0 A 115202.020 0 (none)
24 75 0 A 115202.020 0 (none)
25 76 0 A 115202.020 0 (none)
26 77 0 A 115202.020 0 (none)
27 78 0 A 115202.020 0 (none)
28 79 0 A 115202.020 0 (none)
29 80 0 A 115202.020 0 (none)
30 82 0 A 115202.020 0 (none)
31 83 0 A 115202.020 0 (none)
32 84 0 A 115202.020 0 (none)

Flags key:

   A = ALIVE
   B = BUSY
   C = CLOSING
   S = SHUTDOWN

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