There is nothing "normal" about getting a sudden, painful spike, particularly if it feels like a violent electric shock. It simply should not be happening. It's natural to immediately blame your stimming equipment. After all, you are directly connected to it aren't you? But this has nothing to do with your stim box, and also nothing to do with whatever file you are using.
You solve a problem like this by eliminating all the possible causes one by one. First place to look is the audio device you are using, in this case your phone. You need to try an alternative device such as a handheld MP3 player.
https://www.e-stim.net/viewtopic.php?t=10063
If you don't have access to one, MP3 players are inexpensive on eBay. You can pick up a nice, used Sony item without spending too much. Even a cheap Chinese player costing just a few bucks is better than what you are experiencing now, and will at least help you discover the source of the issue.
When it comes to stimfiles I always recommend
Tintin119's files as a starting point, because they are predictable with no sudden surprises. Each of TT's eight suites contain many variations on a theme. His "Masturbating" series contains 16 similar alternatives so there's gonna be something in there that hits the spot. Same with "Busty", "Cop" and "MinusPanties", among others.
If you don't already have access to these stimfiles, see below.
--
Stimaddict
*************************************************************************************************************************************************
Just a reminder that *ANYONE* here is welcome to
PM me for a download link to hundreds of free, shared
mp3 stimfiles organized by author - some up to 4 hours long!
There is a monster
40 GB of audio files in total, enough to fry your cock every day until the year 2049!
I cannot post the link here out of respect for this forum's Admin and board rules regarding direct links to other people's work.
----------------------------------------------------------------------------------------------------------------------------------------
*Unlimited access to the
Stimfile Archive with No fees, No registration required, No ads, No catches, No expiry date and No hidden motives.
----------------------------------------------------------------------------------------------------------------------------------------
PLEASE NOTE: New members need to post 3 times within this forum before you can send PMs. Please
DO NOT post asking for the link to be sent. It's easy to make 3 posts. Post an introduction, post your experiences, post a question, post a reply to another post - post anything estim related!!